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DDR2 Memory Modules for Overclockers

Corsair TWIN2X1024A-5400UL

Corsair has sent us their TWIN2X1024A-5400UL memory kit that consists of two identical 512MB DIMM modules intended for use in dual-channel configurations. Although TWIN2X1024A-5400UL modules undergo compatibility tests before reaching shops, Corsair specifically mentions that this memory is recommended for use in mainboards based on NVIDIA’s nForce4 SLI Intel Edition chipset. This is more of a marketing statement, though. At least, we had no troubles with this kit when we installed it into mainboards based on Intel’s chipsets.

According to Corsair, TWIN2X1024A-5400UL modules are one of the best DDR2 SDRAM offerings from the company. This memory is tested for operability at 675MHz frequency and with 3-3-2-8 latencies. Note that these characteristics apply only to version 1.2 TWIN2X1024A-5400UL kits (the version number is indicated on the module’s sticker). For earlier versions of its DIMM kits the manufacturer guaranteed more aggressive timings (3-2-2-8), but later they decided to worsen the characteristics a little to reduce the manufacturing cost.

The modules from the kit look quite typically for Corsair’s produce. They are covered with aluminum heatsinks painted glossy black. A sticker with an XMS2 series logo is on one side of the module, and a sticker with the marking is on another. The latter sticker among other things tells you the frequency and capacity of the module.

So, here is the official specification of the Corsair TWIN2X1024A-5400UL memory modules:

  • Frequency: 675MHz DDR
  • Tested at 3-3-2-8 timings and 2.1V voltage
  • Structure: eight 64MB DDR2 chips
  • The kit includes two 240-pin unbuffered DDR2 SDRAM modules, 512MB each, without ECC
  • The modules are equipped with aluminum heatsinks with a black glossy surface
  • The modules come with a lifetime warranty

Note that the standard voltage of DDR2 SDRAM is 1.8V, but Corsair declares 2.1V for these modules. So, if you want to use your TWIN2X1024A-5400UL kit in the specified mode, make sure first your mainboards supports this voltage, too.

The information from the module’s SPD differs from the specification somewhat:

As you see, the SPD latencies are less aggressive than those from the specification. This discrepancy is due to Corsair’s trying to ensure maximum compatibility of its modules with various platforms. For TWIN2X1024A-5400UL modules to work in all configurations and at 1.8V voltage, less strict settings are written into their SPD.

Our tests proved that Corsair’s TWIN2X1024A-5400UL modules are kind of universal. That is, they can work at 675MHz with extremely low timings but can also work at a much higher frequency if the latencies are increased a little.

 
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