Corsair TwinX512-4000 Review @ Intelforums

" As mentioned, the TwinX512-4000 kit consists of a matched pair of 256 megabyte PC4000 modules, pretested to 'run at DDR500 (250 MHz) on a Canterwood based dual-channel motherboard.' Being a leading manufacturer of high performance memory modules for nearly 10 years now, we have been historically very impressed with Corsair modules, and expect no different from their TwinX512-4000 offering"
They didn't have much luck overclocking these modules but if you think about it DDR500 is already a pretty good overclock.

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