Asus RT-AC68U AC1900 802.11ac router

Gordon Kelly

By Gordon Kelly



  • Recommended by TR
Asus RT-AC68U


Our Score:


Asus RT-AC68U: Settings

Given the Asus AC68U's vast array of features and functionality Asus must be applauded for the ease of its setup. Like the best modern routers it is now CD-less and a user simply connects to either of the router's initially security-free wireless 2.4GHz and 5GHz SSIDs and they are immediately guided through a browser-based setup wizard.

The wizard immediately prompts you to set admin and wireless passwords, detects your Internet connection (or lets you enter wireless settings manually) and you're away. One area that hasn't changed since the AC66U is the settings UI, but there is little need as it remains one of the most intuitive on the market.

In fact, the only complaint we have is Asus' AiCloud still doesn't let you remotely access these settings like Linksys' Smart WiFi. This is great for parents who want to tweak parental controls when out the house or offer remote technical support. Fingers crossed Asus will address this one omission before too long.

Asus RT-AC68U setup

Asus RT-AC68U: Performance

Both in looks and on paper the AC68U appears to be in a class of its own and we're happy to say that is how it turned out in testing.

Asus RT-AC68U wireless acIn fact, the Asus AC68U was so fast we actually hit bottlenecks in our NAS and wireless adaptors for the first time. Subsequently we upgraded our test equipment to a premium, as-yet-unannounced Synology NAS (which we will also be reviewing soon) with Western Digital Red label NAS-specific hard drives and an Asus PCE-AC68 AC1900 PCI Express wireless ac adaptor.

Critically, the bottlenecks occurred at 42MBps something no other router has reached. We went back and retested the fastest routers we've seen to date (the Linksys EA6700, Asus RT-AC66U and D-Link DIR-868L) and their results were unaffected. So on with the scores.

In our residential test environment at 2m and 10m line of sight and 13m behind two standing walls over 802.11ac the AC68U turned out barnstorming figures of 47.2MBps (377.6Mb/s), 44.3MBps (354.4Mb/s) and 29.7MB/s (237.6Mb/s). The first two speeds blow away the competition with 39.1MB/s (312Mb.8Mb/s) and 35.2MB/s (281.6Mb/s) from the AC66U and EA6700 respectively the fastest we had seen at 2m and 10m. At 13m the gap closes substantially, but the AC68U still bests the previous 28.8MB/s (230.4Mb/s) benchmark of the EA6700.

Asus RT-AC68U 2.4GHz802.11n 5GHz was less explosive, but still set new highs at all three distances reaching 24.6MB/s (196.8Mb/s), 23.6MB/s (188.8Mb/s) and 16.9MB/s (135.2Mb/s) - graphs in the gallery. At 2m and 10m the AC68U only just creeps ahead of past speeds, but its 13m performance is significantly higher than the 14.1MB/s (112.8Mb/s) of the D-Link DIR-868L - which in itself was 30 per cent faster than any previous router we'd tested.

It is rare we're more interested in 802.11n 2.4GHz speeds than 802.11n 5GHz, but with TurboQAM in the mix that was the case here and again we got fireworks. 14MB/s (112Mb/s), 11MB/s (88Mb/s) and 8.94MB/s (71.52Mb/s) are once more a trio of new records with the 2m and 13m figures in particular way ahead of the 11.6MB/s (92.8Mb/s) and 5.3MB/s (42.4Mb/s) of previous standard-bearer the AC66U. In fact even the occasional dips in the AC68U's 13m result are above 6MB/s.

Interestingly these figures are proportionately in line with the boost from 450-600Mbit. Not wanting to leave out the multitude on devices sans-TurboQAM we also ran these speeds through a desktop replacement Sony F Series laptop. Happily is did benefit and speeds at all three distances remained faster than anything we'd seen before.

Asus RT-AC68U USBFinally we come to USB performance. Again this interests us more than usual as we have ranted about underpowered router hardware sabotaging these speeds for years. This line of argument is vindicated by the AC68U as it produced speeds of 14.9MB/s (119.2Mb/s) and 12.8MB/s (102.4Mb/s) from its USB 2.0 and USB 3.0 ports respectively - nearly triple what we usually experience.

And yes you read that right, USB 2.0 performance edged USB 3.0. This shouldn't be too surprising since neither speed challenges USB 2.0's performance limits and goes to show the inclusion of USB 3.0 at this stage is really more of an advertising gimmick than something crucial for hitting new speeds. Perhaps this will change if routers begin a CPU spec war.

ac 2Update 03.12.13 - the RT-AC68U and the PCE-AC68 have both received significant firmware updates since these tests while we have also switched our default router testing NAS to the excellent WD MyCloud.

While there were no improvements to 802.11n performance after these changes, 802.11ac speeds leapt significantly. We recorded speeds of 74.4MBps (595.2Mbps), 64.3MBps (514Mbps) and 41.2MBps (329.6Mbps) at 2m, 10m and an increased final distance of 15m (behind two solid walls) which we will use for all testing from now on as wireless ac performance continues to skyrocket. Speed graphs opposite.

This superb scores won't change the overall score of the RT-AC68U in light of the arrival of the Linksys EA6900, but both AC1900 routers now stand head and shoulders above the AC1750 products which saw no increases under our new test setup. We now await the UK release of Netgear's debut AC1900 router, the R7000 'Nighthawk', with baited breath.


September 18, 2013, 12:59 pm

When will this become available. Any insights here??

Gordon Kelly

September 18, 2013, 2:31 pm

I'm told it will be at the start of October, but that some units may slip out to retailers before then.

Waqar Zia

September 19, 2013, 10:20 am

I'm curious as to why USB-attached HDD performs way slower than a NAS; does this means that the router's USB interface hardware is the culprit, and is it the case also with other routers?


September 19, 2013, 2:21 pm

No cloud based config/setup? For anyone that actually cares about their network security, that's a huge plus.


September 19, 2013, 5:41 pm

No cloud is actually a plus!


September 19, 2013, 8:43 pm

I take it this doesn't wall mount like the AC66U does. I'd like to upgrade but need it to wall mount.


September 19, 2013, 10:38 pm

is it bcm4709 or bcm4708?

I read somewhere else it is bcm4708

Gavin Martin

September 20, 2013, 9:43 am

My crappy sky-issue Netgear seems to have died overnight and needs immediate replacement....would I be disappointed with the AC66u since the AC68 isn't available yet? Thinking of making a long term purchase here....or is the Linksys 6700 a better bet?

Gordon Kelly

September 20, 2013, 9:50 am

No it doesn't. That is a downside of the design change.

Gordon Kelly

September 20, 2013, 9:50 am

Depends on your perspective and needs. Despite its controversial launch I've found Linksys' Smart WiFi to be incredibly useful.

Gordon Kelly

September 20, 2013, 9:51 am

See above.

Gordon Kelly

September 20, 2013, 9:52 am

There are numerous factors, but a lack of horsepower for properly caching the more resource intensive USB and powering the external drives themselves is certainly a factor. The former is clearly improving with the AC68U though and that can be seen from these speed results

Gordon Kelly

September 20, 2013, 9:53 am

Given you speak of a long term investment I'd wait the extra few weeks required. The AC66U is also a superb router, but when its successor just so close to market I think you'll that'll always grate should you buy the AC66U now.

Gavin Martin

September 20, 2013, 9:55 am

I've also realised - I'd need a separate DSL modem. So no snap decisions for today, I'm stuck using my HTC One Wifi Hotspot for now! It's been a few years since I bought any networking stuff so need to do my research! On another note I looked at what PC World are stocking and they don't seem to have any up to date routers - no wonder retail struggles when they can't stock new tech!

Gordon Kelly

September 20, 2013, 10:23 am

4709, as mentioned in the review ;)

Gordon Kelly

September 20, 2013, 10:24 am

You could say the same about networks and iPhone stock...!

But you're right to do your research. The Linksys EA6900 should be one to watch, but I recognise some dislike its Smart WiFi Cloud platform.


September 20, 2013, 11:24 am

This is my next router.


September 22, 2013, 5:57 am

Is WIRED performance any faster than on the Asus RT-N66U?

Jüri Pranstibel

September 22, 2013, 10:34 am

Is it wall-mountable?


September 23, 2013, 2:58 am


Did ASUS put a small fan in this one? The AC66U runs pretty hot and standing it up may help but a fan would really help.

Gordon Kelly

September 23, 2013, 10:39 pm

Nope. That is a downside

Gordon Kelly

September 23, 2013, 10:40 pm

No faster over wired - we're at the limits of Gigabit Ethernet rather than the limits of the routers.

There's no fan and the 68U runs fine, though I also had no problems with the 66U running hot.


September 23, 2013, 11:34 pm

How did you get your review unit so early? I don't see any other reviews yet, good job!


September 24, 2013, 2:42 am

The figure of 47.2 MBps (377.6 Mbps) is impressive in one sense, but on the other hand is only 29% of the maximum theoretical rate for 3x3 11ac (1300 Mbps).
Normally we would expect around 70% efficiency - so do you have any idea why this is so low?
At 2m the SNR should be high enough to support the maximum MCS, but maybe the line-of-sight MIMO channel can't support 3 spatial streams? Did you check the bit rate reported by the client (in Status)?


September 24, 2013, 9:24 pm

Hi, Will it support 3g dongle as internet source - once of the selling points of ac66u was this features.

Thanks, great review BTW

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