Best SSD 2018: 14 SATA, M.2 and PCIe drives tested for performance

Looking to build a gaming rig or desktop PC for creative work? Then you’re going to need a decent SSD.

But which to go for? These days the world of storage is racing forward at a crazy pace, with each new day seeing all manner of new technologies hit the market. Only the other day we saw Samsung announce its catchily named 32TB PM1643 enterprise grade SSD.

While this is on the one hand great, offering buyers a variety of different options to meet their specific needs and budget, it also makes knowing which to get a little tricky. Here to help clear up the confusion we’ve tested all the big-name products on the market to offer the definitive list of the best SSDs currently available.

Also make sure to check out our below buying guide to get an idea of the exact type you need.

What is an SSD?

An SSD (solid-state drive) is the simplest and most cost-effective upgrade you can make to a laptop or desktop. Not only will it speed up your PC’s boot-up times, but opening applications and searching for files will be quicker too; in general, it will make your system feel far more snappy.

In the very simplest terms then, an SSD performs exactly the same function as your regular hard disk (or hard drive, if you prefer) but much, much faster. It replaces the mechanical aspects of your hard disk with non-moving transistors. Although more expensive than a hard disk, the performance benefit an SSD offers is absolutely worth the money.

Related: How to install an SSD in your laptop

SSD jargon explained

NAND Flash: Negative AND Logic gates. They’re similar to the chips used in RAM, but they can store data even when there’s no power flowing through them. They form the basis of all SSDs.

SSDs, like other storage devices, are little computers in themselves. Controllers look after the algorithms that sort through data. The faster the controller, the better the performance.

SATA: Serial ATA. This is the most common, and cheapest type of SSD. It connects through your motherboard’s SATA ports and while it’s several times faster than a regular hard disk, it’s the slowest form of SSD, topping out at about 500-600MB/s. The current version of SATA is SATA III.

NVMe: Non-volatile Memory Express. This type of SSD connects over PCIe (PCI Express), with drives topping out at over 3000MB/s. You’ll either find it connecting directly to your motherboard’s PCIe slots or over M.2 (below), also using PCIe lanes.

M.2: This is a specific physical SSD format. Confusingly it can use both the SATA or PCIe lanes on your motherboard, but either way it fits into a smaller M.2 slot. M.2 SATA drives are most commonly found on ultra-thin laptops to save space (M.2 is very small) and cost (sometimes only using SATA-speed storage). If you’re buying an M.2 SSD for your desktop, make sure it’s an NVMe drive.

SSDs used to have a reputation of being unreliable and having a short lifespan, technologies such as TRIM have made this much less of a worry. However, all SSDs come with a data warranty and a timed warranty, and your coverage expires whichever comes first. The SSD can track how much data it’s written, so if you send it off for repair and that’s been exceeded you probably won’t get a free repair. More expensive SSDs have more generous warranties.

Related: All of our PC component guides

How We Test SSDs

Benchmark applications AS SSD and CrystalDiskMark run each drive through a variety of tests. Their sequential read and write routines test the raw file-copying pace of each drive, while a variety of random read and write tests demonstrate how responsive the drive is to the more random use a drive is put through during day to day use – the “snappy” feel of an SSD is all about its random read access performance.

ATTO’s benchmark also tests the read and write pace of each drive, but it uses an even larger variety of file sizes, which adds further detail to the picture of how each SSD will perform.

Related: Best SSD deals

SATA: Corsair Neutron XTi

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Key features:

  • Available in 960 and 1920GB options, 240 and 480GB models discontinued
  • Five-year warranty, 320TB endurance rating (480GB model)
  • Review price: £180 (480GB model)

This is the first SSD we’ve seen from Corsair for quite some time, and it’s taking aim at the mainstream market. That’s expected, because SATA drives such as this now sit between traditional hard disks and M.2 SSDs when it comes to speed and price.

The Neutron XTi sits at the top of Corsair’s new stack of SSDs, and this 480GB model costs £180 – a middling price that undercuts Samsung’s 850 Pro, which is starting to show its age. Unfortunately, since our original review, Corsair has confirmed that it’s stopped producing the 240GB and 480GB capacities, so you’re now limited to the much more expensive 960GB and 1920GB options.

The new drive is made of 15nm MLC NAND, and it’s based around a Phison controller that has four cores. That specification is entirely conventional, and it pushes the limits of performance on a SATA drive – sequential read and write speeds generally rub up against the 600MB/sec peak bandwidth of a SATA 3 connection.

To try to get around this issue and provide better performance in areas that aren’t saturated, Corsair has doubled the RAM allocation that the Neutron’s controller usually supports – so there’s 512MB of DDR3 installed on this SSD’s PCB.

The drive’s red exterior helps the Neutron stand out in a market filled with dark metallic products, but don’t expect many extras – there’s a 7mm-to-9.5mm blanker, but that’s it. There’s a five-year warranty, which is solid, and a decent 320TB endurance rating.

The Corsair’s sequential read and write speeds of 560MB/sec and 542MB/sec are good – not far away from the SATA connector’s limit – and those figures are slightly better than the Samsung 850 Pro.

Corsair added that extra memory to improve the Neutron’s performance away from sequential file tests, and it traded blows with the Samsung in these tests. In AS SSD’s 4K-64 random file test, the Corsair managed a read speed 369MB/sec and 358MB/sec, while the Samsung ran at 384MB/sec and 320MB/sec. Corsair’s drive was faster in most of the Atto benchmarks, but the Samsung SSD was quicker in the smallest file test, and its drive access speeds were always faster too.

Corsair’s drive then scored 7297 in the Iometer benchmark – about 600 points short of the Samsung.

The 320TB endurance rating and five-year warranties are both very generous, and while it’s half the warranty time of Samsung, it actually beats the equivalent 512GB drive’s 300TB endurance rating.

It’s a shame Corsair has already dropped its cheaper models, but if you’re after a high-capacity SSD the high-end options might be up your alley.

SATA: Crucial MX300

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Key features:

  • Available in 275, 525GB, 1 and 2TB options
  • Three-year warranty, 160TB endurance (525GB model)
  • Review price: £119 (525GB)

Crucial has developed a keen reputation for its affordable SSDs, and the MX300 is the third generation in one of its flagship ranges.

The new drive sees Micron – Crucial’s parent company – debuting its 3D Flash chips, which means its technology now matches those of Samsung and SK Hynix. The 3D chips deploy transistors across four planes, which means chips can be far denser and, therefore, cheaper. The MX200 used silicon dies that could hold 256GB of data, but the same dies in the MX300 hold 384GB.

Cost isn’t the only advantage. The Floating Gate transistors used here reduce electrical disruption and wastage from neighbouring cells, which cuts power consumption and can contribute to increasing the lifespan of the drive.

We’ve reviewed the 525GB version of the MX300. That’s sizeable, but tech fans will know that it’s a break from the usual 500GB and 512GB products. That’s because the new dies are 48GB in size, so Crucial builds the MX300 with eleven dies and a little overprovisioning.

The MX300 includes TRIM support, AES 256-bit encryption and SMART monitoring alongside data path and power loss protection, which is a decent roster of features at this price. Samsung’s drive offers additional customisable overprovisioning and cache memory, but those are niche features.

It’s 160TB endurance rating isn’t the most generous, but the three-year warranty is fine.

The MX300’s new 3D Flash means that prices can come down, but benchmarks suggest that performance hasn’t improved across the board – especially read performance.

The new drive’s sequential write speed of 482MB/s is a tad better than its predecessors, but the read result of 470MB/s is behind both the MX200 and the Samsung 850 Evo. That pattern continues: the MX300’s AS SSD 4K and 4K-64 write results were both quicker, but its read results were slower.

The same pattern emerged in CrystalDiskMark, with better write results and poorer read speeds. However, the MX300 was never a top performer: neither result got beyond 500MB/s, while the Samsung drive broke that barrier in sequential reads and writes.

The Atto benchmark revealed more of the MX300’s strengths and weaknesses. Its small-file read and write results of 378MB/s and 404MB/s were both better than the MX200, with the latter also faster than the Samsung. However, the new drive faltered by the time it was tasked with larger files: behind its predecessor when reading files, and behind the Samsung when reading and writing.

The MX300 fought back in IOMeter. Its total I/O result of 7006 is decent, and its 268MB/s speed average is also good. However, its average response time was worse, suggesting that this drive can be sluggish to spring into action.

Crucial’s latest drive delivers mixed performance when compared to the MX200 and Samsung’s 850 EVo – but it’s important to remember that the MX300 is never slow. Its price is attractive, its endurance rating is better than both rivals, and it’s a little larger than those too. It won’t break speed records, but this is a reliable, affordable SSD.

SATA: AData SX950

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Key features:

  • Available in 480 and 960GB options
  • Six-year warranty, 200TB endurance rating (240GB model)
  • Review price: £110

We’ve not seen many AData drives before, but the company arrives with a bang with its new SX950. This 240GB SSD costs £110, which means it sits between the Samsung 850 Pro and Crucial MX300 drives – and those have been affordable favourites for a long time.

The SX950 doesn’t just take aim at those two popular products – it’s got gamers in its sights, too. AData has made some tweaks to the internals and says they will improve performance in the latest titles.

The drive is built using Micron’s 3D MLC NAND, which is appearing in more and more drives now. There’s good reason for that: MLC memory offers a good balance between performance and reliability, and stacking the memory in vertical layers means manufacturers can ease off on miniaturisation, which allows them to raise capacities, improve efficiency and lower prices.

AData has made a solid choice with 3D MLC, and part of the memory is partitioned off to create a cache that mimics SLC memory. SLC memory is fast, but it’s less reliable and efficient, so mimicking its benefits while bypassing its problems is a smart idea. In this drive it’s managed by the Silicon Motion SM2258 controller, and AData says its improved firmware uses an algorithm to detect which operations will benefit the most from that extra cache.

The 240GB model we’ve reviewed has a 200TB endurance rating, which is better than the MX300 and the Samsung 850 Evo, and it’s also available in 480GB and 960GB versions that have 400TB and 800TB endurance levels. The SX950 has a six-year warranty, which is extremely generous – twice as long as the Crucial and a year better than the Samsung.

The SX950 supports SMART operation and, unusually, comes with a 2mm blanker and a 2.5in to 3.5in adapter – ideal for fitting this SSD into a wider range of devices. It doesn’t have any encryption, however, which is something that its rivals do include.

The AData’s CrystalDiskMark sequential read and write speeds of 564MB/s and 514MB/s outpaced both rival drives, but it couldn’t maintain this good start. Its 512K speeds were a long way behind the competition, and it couldn’t keep up with handling smaller files either.

That form carried through to Atto. Its 8KB read and write speeds of 187MB/s and 174MB/s were miles behind the Samsung and Crucial drives, but it hit a read pace of 564MB/s in the 256KB test and stayed there – a result that was ahead of both rivals. Its best write pace, of 514MB/s, equalled the Crucial and almost matched the Samsung.

The AData’s overall IOMeter score of 8977 outpaced both other SSDs, and its 343MB/s pace was faster than the Crucial and Samsung drives, but its response times were both poorer than the Samsung.

Patterns emerge when testing, and it’s not all bad news. The AData isn’t brilliant when handling the smallest files, and its write pace can’t quite match its read speed – but it was rarely far behind. Its reading performance was excellent and consistent, which is vital for a gaming SSD.

Its Atto performance demonstrates the SX950’s impressive read pace, and its six-year warranty and high endurance rating cements its reliability. It’s a little more expensive than its rivals, but this impressive SSD justifies its cost for gamers

Samsung 860 Evo

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Key features

  • SATA, M.2 and mSATA options
  • 250GB, 500GB, 1TB, 2TB and 4TB available
  • Five-year warranty
  • 2400TB data endurance
  • Review price: £91

The Evo 860 is the noble successor to the 850, which was our favourite SATA SSD for some time. It offers a number of key upgrades, chief among which is boosting its maximum storage to a whopping 4TB.

The 860 Evo ekes out every last possible drop of performance from the ageing SATA 6Gbits/sec interface to offer buyers a well-priced and ultra-reliable SSD that’s notably faster than its successor.

However, if you have the cash to splash – and a machine with the newer, more modern NVMe interface – the 960 Evo easily outperforms the 860 Evo and is therefore a better choice for high-end rigs.


Read the full Samsung 860 Evo review


Key features

  • Five-year warranty, 75TB endurance rating (250GB model)
  • 120, 250, 500GB, 1, 2 and 4 TB models available
  • Review price: £81 (250GB model)

The 850 Evo is getting on a bit now and has been overtaken  by the newer 860, but it’s still great value. It uses similar technology to the top-end 850 Pro, but 850 Evo is cheaper because it uses TLC (triple-level cell) rather than MLC memory – a design that saves cash but reduces performance and endurance.

Despite that, the 850 Evo wasn’t far behind the 850 Pro in many benchmarks. Its 510MB/sec and 499MB/sec sequential read and write scores are only 17MB/sec and 3MB/sec behind the pricier Samsung, and it traded blows with the 850 Pro in small-file tests – it was faster when reading and slower when writing.

The 850 Evo proved adept with small-file tests in the ATTO benchmarks, but fell behind in larger tests, and then fell into the middle-ground in Iometer – unable to best the 850 Pro, but still further ahead of many drives at similar prices.

The Evo’s five-year warranty is among the most generous we’ve seen, even if it’s unable to match the mighty ten-year deal that Samsung includes with the 850 Pro. The 75TB endurance rating (on the 250GB model here) is looking a bit paltry these days when rivals offer more than double.

The 850 Evo strikes a fantastic balance between price and performance – slower than the 850 Pro, of course, but much more affordable. If you want a rapid SSD and would rather not compromise with a budget drive, this is a good option.

At the time of review, the Samsung 850 Evo 250GB was available for £81.

Read the full SATA: Samsung 850 Evo review


Key features

  • Incredible benchmark performance
  • Mighty capacity
  • 120, 256, 512GB, 1TB capacities available
  • 10-year warranty, 300TB endurance rating (512GB)
  • Review price: £176 (512GB)

Samsung’s flagship SATA SSD reaps the rewards of the firm controlling every stage of its production. It’s more than two years old now, and it looks like stock is starting to dwindle, with only a few UK stores stocking capacities about 256GB. It’s also gone up in price since we first looked at it in 2015.

In our sequential benchmarks, it, put in sequential read and write scores of 520MB/s and 498MB/s respectively, which is a bit slower than the Corsair Neutron.

In the all-round ATTO test the 850 Pro led in most benchmarks, and its Iometer long-term test result of 7,826 still puts it at the top of the SATA SSD pile.

The 850 Pro’s ten-year warranty is also longer than the deals offered with rival SATA drives, and its 7mm body is smart and slick. It also benefits from a fantastic endurance rating of 300TB on this 512GB model – thanks, in part, to Samsung’s revised 3D V-NAND system, which deploys transistors in an arrangement that reduces wear.

It’s getting on a bit, but it’s still very much worth a look because, as the limits of SATA are reached by other manufacturers, Samsung’s been there or thereabouts the whole time. The Corsair Neutron is a bit faster in sequential tests, but Samsung pulls it back in Iometer and 4K-64 random tests.

At current pricing, the Corsair is a better deal, given its more generous data warranty, lower cost and excellent performance. But keep an eye on 850 Pro pricing, because if it shifts a little, it could be a better deal again.

Read the full SATA: Samsung 850 Pro review

M.2: Intel 600p

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Key features:

  • 128, 256, 512GB and 1.02TB models available
  • Five-year warranty, 288TB endurance rating (512GB)
  • Review price: £198 (512GB)

Intel has spent years trying to make inroads into the SSD market, and it first released NVMe drives on PCI cards. This time around, though, the 600p has been released as a pure M.2 drive.

This drive is a NVMe product with a difference – it isn’t designed to break speed records. Instead, it’s a mainstream product that’s built to easily outpace SATA drives, without breaking the bank.

Intel has worked with Micron to develop the 3D NAND used inside this SSD, and there are plenty of similarities between the 32-layer silicon here and the memory used to build the Crucial MX300.

The 600p can access the full NVMe allocation of four PCI Express lanes, and the drive is controlled by a Silicon Motion SM2260 unit with customised Intel firmware. It’s a dual-core ARM chip, and the firm has good form when it comes to drives that offer solid performance for reasonable prices.

It also has a five-year warranty, which matches the best drives on the market – many other affordable drives make do with two fewer years. That’s good, but the Intel’s 288TB endurance rating is more middling, and may concern those who run storage-intensive workloads. Still, not bad for the money.

The Intel drive’s CrystalDiskMark results are solid. Its best speeds come when reading files: its CrystalDiskMark sequential pace of 1318MB/sec is three times as quick as many SATA SSDs, and in the Atto test it peaked at 1164MB/sec – another fine result.

It’s a little slower when writing files. Its best speed here was in Atto, where it topped out at 568MB/sec. That’s only a little better than most SATA drives – so it’s an improvement, but only just.

Still, its small files speeds were better than many SATA drives, and its access times were good, too – often a little better than conventional SATA SSDs. Its overall Iometer score of 15,085 is about twice as good as the best traditional SSDs, too.

The Intel 600p isn’t the quickest NVMe drive we’ve tested, but it’s one of the cheapest, and it still delivers a solid speed boost over SSDs, especially when writing files. It’s a solid part for taking the step up without spending wads of cash.

M.2: PNY CS2030

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Key features:

  • Impressive sequential read and write speeds
  • Available in 240GB or 480GB
  • Tempting low price
  • Three-year warranty, no data endurance rating stated
  • Review price: £115 (240GB)

The CS2030 is PNY’s first consumer NVMe drive, and the gaming firm has taken an interesting approach with this product.

Instead of taking aim at Samsung and other top-tier rivals, this 240GB unit costs £115 – which means it’s cheaper than many NVMe drives and conventional SSDs offering the same capacity.

The tiny M.2 SSD is built around a Phison E7 controller, which is a quad-core chip with the usual features – AES 256-bit encryption and Smart technology, for example.

Under the hood, the PNY uses Toshiba’s 15nm MLC NAND. Those chips are reliable performers, but they’re a step behind many other NVMe drives that use 3D NAND with more layers – Samsung and Intel both now use such a system.

We’ve reviewed the 240GB version of this drive, but the only other capacity available is 480GB. That’s unusual; most other SSDs are available with a 1TB version, or maybe a 2TB variant. It isn’t a big deal if you’re going to pair the PNY with a hard disk or a larger SATA SSD, but it could be an issue if the PNY is the only SSD in a system filled with applications or games.

The PNY offers only a three-year warranty, which is two years short of the deals included with many consumer SSDs. What’s more, there’s no trace of an endurance rating in the paperwork. It is, however, rated for two million hours of use, which puts it at the very top of the stack compared to other SSDs with timed endurance ratings.

PNY’s drive made a solid start in sequential read and write tests. Its CrystalDiskMark speeds of 1481MB/sec and 1324MB/sec are fine – several times quicker than SATA drives, and very consistent. It was solid in Atto, too, quickly reaching those sorts of speeds even when handling smaller files.

The PNY delivered more middling results in AS SSD’s small file tests, which indicates that this SSD may sometimes struggle with more intricate tasks.

For the most part, though, there’s a lot to like about the PNY. It’s quicker than the Intel 600p in many tests, and delivers SATA-beating speed for similar prices.


Key features:

  • 250GB, 500GB or 1TB capacity
  • M.2 form factor
  • Three-year warranty, 100TB endurance rating (250GB)
  • Review price: £140 (250GB)

Best-value M.2 SSD

While the 960 Pro stole all the headlines, Samsung’s 960 Evo is the sensible buyer’s choice. You get brilliant performance for a lot less cash, making the Evo a more attractive mass-market choice.

Some of the new tech used on the 960 Pro remains, including a new five-core “Polaris” controller, 3D V-NAND and ample on-board memory.

Using cheaper TLC memory (as opposed to MLC) It’s not as fast as its more expensive brother, but it also makes use of Samsung TurboWrite technology that gives it a big performance boost in short bursts of activity using a small amount of faster SLC cache.

In the AS SSD benchmark, it topped out at a read speed of 2,034MB/s and a 1,847MB/s write speed. This puts it in the same league as the Toshiba OCZ RD400.

It trades blows with the 960 Pro in some benchmarks, which you can read more about in our full review. Elsewhere, it beats many of its rivals and is priced attractively as well.

It doesn’t have the same generous warranty as its more expensive sibling, so if you’re going to be pushing this drive with big loads daily, you might be better off going for a more expensive drive with better cover. For most regular gaming PCs, though, this is a fantastic-value choice.

At the time of review the 250GB Samsung 960 Evo was priced at £140.

Read the full M.2: Samsung 960 Evo review


Key features:

  • 512GB, 1TB or 2TB capacity
  • M.2 form factor
  • Five-year warranty, 800TB endurance rating (1TB)
  • Review price: £690 (1TB)

The Samsung 960 Pro is the ultimate M.2 SSD, putting in benchmark results that were by far and away the best we’ve seen. But it’s not surprising when you consider Samsung’s one or two-year lead in flash memory technology.

But you pay for that speed: the cheapest 512GB model cost £300 at the time of review in late 2016, topping out at £1100 for the 2TB model.

The 960 Pro is an improvement on its predecessor 950 Pro for several reasons. It manages to stack loads more transistors on top of each other, meaning greater capacity is possible in half the space.

The on-board “Polaris” controller has improved as well, and now features five cores instead of three, for even better performance.

You can read about the technicalities in more detail in our full review.

In the AS SSD benchmark, it scored 2,823 MB/s read speeds and 2,346MB/s write speeds; that write speed is nearly 1GB/sec ahead of the next-best PCIe model we’d tested at that time. We also tested in CrystalDiskMark, with read and write speeds clocking in at 3,454MB/s and 2,157MB/s.

Small file speeds are slightly slower, with 4K reads and writes coming in at 36.5MB/s and 159MB/s. It’s beaten by both Intel and Zotac here.

It’s not the fastest at small files (but still very fast) and obliterates the competition in big file transfers. Even better, there’s a massive 5-year warranty or 400TB, 800TB and 1,200TB data warranty (for 512GB, 1TB and 2TB respectively), whichever comes first.

It’s stupendously expensive and ultimately a very niche piece of kit. But those who want ultimate performance should seriously consider the 960 Pro.

Read the full M.2 Samsung 960 Pro review

PCI-E: Corsair Neutron NX500

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Key features:

  • Available in 400 and 800GB options
  • 5-year warranty or 698TB endurance rating (400GB model)
  • Review price: £325

The latest SSD from Corsair is an increasingly rare product: an NVMe drive that arrives on a PCI card for high-end systems that demand the best speeds around.

It certainly looks the part. Its black, half-height card is dominated by a chunky heatsink that mimics the design found on the Corsair One gaming PC, and its sides are covered with smart metal slats that act as heatsinks. The PCI bracket at the end of the card has triangular heat vents, and the rear of the drive is covered with plain metal.

It’s the largest PCI-E SSD we’ve seen, and it’s the best-looking –  ideal if you have a window on your case and really want to show off your PC’s internals.

The NX500 uses a PCI-Express x4 connector, so you’ll need one of these slots – or a longer x8 or x16 slot – to use the Corsair in your computer. On the inside, it uses a familiar Phison E7 controller that’s been tweaked with custom firmware to provide more space for overprovisioning, which should improve reliability and write speeds.

Its biggest competitor is the Intel 750 Series, which is a few pounds cheaper than the Corsair. The Intel drive also offers a bit more space – there is 480GB of theoretical capacity in the chips on the Corsair card, but only 400GB available to the end-user.

Corsair produces an 800GB version of the NX500, but that’s it. Intel, meanwhile, produces an 800GB version and a 1.2TB model.

The Corsair’s memory is 15nm Toshiba MLC, which is an improvement over the Intel – that drive had 20nm chips. There’s 1GB or 2GB of memory depending on which capacity of drive you buy – more than most SSDs. Its five-year warranty matches Intel.

Corsair’s drive impresses in most benchmarks. Its CrystalDiskMark sequential read and write speeds of 2839MB/s and 1553MB/s are easily ahead of the Intel drive, with the former figure more than 1,200MB/s quicker. The Corsair was slower than Intel with 512KB files, but it took back a huge lead in the 4KB small file tests.

The in-depth Atto disk benchmark further illustrate the Corsair’s solid speeds. It was quicker in every read test, and its peak pace of 3048MB/s was around 500MB/s better than Intel. The Corsair’s small file write speeds were initially slower, but the NX500 quickly overtook Intel’s drive and finished the test with a lead of 1147MB/s. Our final test, IOMeter, saw the Corsair score 17,064 points – nearly three times as many as Intel’s drive managed.

Corsair’s drive is faster than Intel’s SSD in most tests, and it barely costs any more. It’s also got the same length of warranty and better physical design. PCI-E SSDs like this are niche products and only a few people will truly need this speed, but if you tick that box then the NX500 is an excellent bit of kit.

The Zotac Sonix (below) is a little faster and has a higher capacity, but the Corsair pulls this back with its lower price.

PCI-E: Toshiba OCZ RD400

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Key features:

  • 128, 256, 512GB, 1TB models available
  • Five-year warranty, 296TB endurance rating (512GB)
  • Review price: £350 (512GB)

This is one of the first enthusiast OCZ SSDs to emerge since Toshiba swallowed up the firm back in 2013, and it’s a bit of a barnstormer. It’s a PCIe product, which means it uses the extra bandwidth provided by the NVMe interface to deliver better speeds than any SATA-based drive can manage.

It also means the RD400 faces competition from some of the world’s best SSDs.

The Toshiba follows the form factor laid out by the Zotac drive (below), which means it’s an M.2 SSD mounted onto an expansion board that slots into a PCIe X4 slot. Unsurprisingly, Toshiba has relied on its own hardware here, with its in-house 15nm MLC NAND being powered by a bespoke controller. OCZ’s involvement seems restricted to some firmware tweaks and a logo on the box.

The RD400 comes with a decent 296TB endurance rating and a reasonable five-year warranty. It’s got most important features, too, although it is missing any encryption.

Toshiba’s latest drive is undoubtedly faster than any SATA SSD, but it’s inconsistent when compared to some other PCIe products. Its sequential read speed of 1,974MB/s is incredible, but it’s a few hundred megabytes behind the competition – and its write pace of 1,226MB/s is closer, but still lags behind. There’s also a big difference between this drive and the competition in smaller files: its 846MB/s and 609MB/s AS SSD read and write speeds are about 500MB/s and 800MB/s slower than the competition.

The RD400 was behind both rivals in CrystalDiskMark’s sequential read test and smaller file benchmark, but was a little quicker with mid-sized files. It also skipped ahead of the competition in that app’s sequential write test.

The Toshiba’s Atto scores also demonstrate further performance inconsistencies. It’s the fastest drive here in small file tests, but in every other benchmark it falls between the slower Intel and faster Zotac SSDs.

Then, surprisingly, the Toshiba easily outpaced its rivals in the IOMeter test. Its average speed of 978MB/s was three times quicker than other drives, and its average response was also about three times quicker.

That’s a good finish for this drive, but it doesn’t do enough to hide the inconsistencies elsewhere. It was middling in Atto and behind its rivals in most of the other benchmarks.

Despite the mixed results, the Toshiba remains one of the fastest SSDs on the market. It’s not got enough speed or extras elsewhere to overhaul the Zotac or Intel drive, but it remains a good option if SATA doesn’t provide enough speed and if the competition is a little too expensive.

PCI-E: Zotac Sonix

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Key features

  • Lighting-fast speeds
  • Reasonable mid-range price
  • Highest endurance rating
  • Three-year warranty, no data endurance rating stated
  • 480GB model only
  • Review price: £380

Zotac’s drive looks great, and it’s just as impressive under the hood. The 15nm MLC NAND used to build this drive has a tighter manufacturing process than Intel’s 20nm memory, and it’s bolstered by a 512MB DDR3 cache. It’s all controlled by a multi-core chip from third-party firm Phison.

That tempting specification is reinforced by a two million hour endurance rating, although a data endurance rating isn’t stated.

It’s a great performer, too. Its AS SSD sequential read result of 2,412MB/sec inched ahead of the Intel, and its write speed of 1,298MB/sec came in second place by a tiny margin. It continued to lead the way in most of the small-file benchmarks, and then topped the table with a CrystalDiskMark read speed of 1,745MB/sec.

It fell behind the Intel again when writing, but its speed of 1,253MB/sec remains excellent – only 25MB/sec behind the Intel drive.

Zotac’s drive bolstered its performance in the ATTO test. Its top read speed of 3,056MB/sec is the fastest out of this group of PCIe drives, and its write speed of 2,276MB/sec is similarly dominant. The Zotac was consistent, too, quickly hitting those top-tier results and maintaining them across several different file sizes.

The final benchmark, Iometer, saw the Sonix SSD rampage through at 8,085MB/sec – another class-leading result.

Zotac’s drive doesn’t beat the Intel in every test, then, but it’s the winner across most of the benchmarks – and its affordable price makes it the best option if you’re after a lightning-quick SSD. Intel’s drive can’t quite keep up, but it remains a great option for larger capacities.

PCI-E: Intel 750 Series

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Key features

  • Vast storage capacity
  • Consistent speeds
  • Unable to match Zotac’s pace
  • Five-year warranty, data endurance rating not stated
  • 400, 800GB and 1.2TB models available
  • Review price: £763

Intel’s 750 Series is one of the most expensive drives in this group, but there’s good reason for its huge £762 price. This SSD doesn’t just pack high-end gear inside – it also has a mighty 1.2TB capacity. There are smaller versions available; the 400GB model starts at £415.

The vast 1.2TB capacity translates to 1.09TB of usable space.

The drive impresses beyond its huge size, too. Intel has used 20nm MLC NAND to form the 750 Series, and Intel has used 32 chips of varying sizes. They equate to 1.37TB of space, which means 18.8% of the drive is given to redundancy areas – a boon for protecting the drive.

The 750 Series SSD comes with an endurance rating of 1.2 million hours. That’s reasonable, but it’s unable to match the Zotac’s rating of two million hours.

The two drives are closer in benchmarks. The Intel’s AS SSD sequential read speed of 2,364MB/sec is less than 100MB/sec behind the Zotac, and the Intel’s write pace of 1,342MB/sec is a little quicker than its main rival. There was barely a gap between the SSDs in the 4K-64 queue depth tests, and those results were mirrored in CrystalDiskMark – the Intel was a little slower when reading but often a tad faster in write tests.

Intel’s drive accelerated to a top ATTO read speed of 2,495MB/sec, which is stunning – but Zotac’s drive was just a tad faster, topping out at 3,056MB/sec. And the Intel’s Iometer result of 6,934MB/sec is excellent, but a tad slower than the Zotac.

Overall, then, the Intel 750 Series is only a little slower than the Zotac drive – but even when it does fall back, it’s never far behind. It’s still ridiculously fast, and its huge capacity makes it a genuine hard disk replacement. It’s expensive, but it justifies the cost with huge size and well-balanced performance.