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TwinMOS TwiSTER PC4000 (DDR500 – 250MHz) CL2.5

Pence per Megabyte - 17.58

Torture Test at 200MHz – Passed

Torture Test Overclocked - Passed

TwinMOS was founded in 1998 and has three manufacturing facilities, one in Taiwan and two in mainland China. Flash memory and wireless LAN products are also part of the TwinMOS portfolio.

To its credit, TwinMOS offers a lot of information on its website including suggested BIOS settings. It also specifies an unusually high operating voltage of 2.8v for this module. This is technically outside the JEDEC specifications of 2.5 to 2.7v for DDR400 unless we’ve missed an update.

The memory chips used couldn’t be identified due to the pre-fitted heat-spreaders though we have been informed by TwinMOS that they’re either from Hynix or Samsung. They are rated by TwinMOS to 250MHz at 2.5-4-4. The modules carry a lifetime warranty though TwinMOS claims that “Any product that has reached the end of its product lifetime (End-of-Life) or is discontinued shall not be covered this warranty.” This strikes me as a little mean.

These modules come equipped with attractive gold coloured aluminium heat spreaders secured with thermal tape and two retaining clips per module.

First Impressions

As I mentioned, these modules come equipped with attractive gold coloured aluminium heat spreaders, which bear a TwinMOS sticker and a screen-printed red and blue “TwiSTER” logo. They look and feel to be of very high quality but this is pretty much the case with all the heat spreader equipped memory.

Packaging was of the familiar semi-rigid blister pack variety and gave ample damage proofing.

Testing – 200MHz

Rank When Tested on a Prescott CPU at 200MHz: 8th from 18

Rank When Tested on a Northwood CPU at 200MHz: 3rd from 18

Very strong performance on our Northwood platform was tempered slightly by a more mundane showing on the Prescott based test rig. Generally the modules behaved well during testing under all situations.

Testing – Overclocking

Maximum Frequency - Overclocked using SPD settings: 230MHz

Maximum Frequency - Overclocked using manual settings (CL-4-4-8) low ambient of 18c: 270MHz

Maximum Frequency - Overclocked using manual settings (CL-4-4-8) high ambient of 28c: 270MHz

Rank - overclocked performance (high ambient): 1st from 18

Not only was the TwinMOS PC4000 able to keep pace with the big-gun Corsair and OCZ PC4400 memory at a whopping 270MHz FSB, it even managed to slightly outperform it’s rivals.


Overall Rank, all performance parameters included: Joint 2nd from 18

With three modules sharing honors for second place, price becomes a major factor and on this score the TwinMOS does well. I find it rather troubling that I could only find one retailer in the UK able to supply this memory, though if it’s as good as its word and can supply these modules in quantity at the claimed 17.6p per Megabyte then this is by far the best bargain in this roundup, bar none.

Incredible overclocking potential alongside solid stock performance make for a very tempting package and one that, assuming TwinMOS is still producing in volume, should be snapped up by distributors and retailers in the UK.

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