Fremont,
Based on carefully selected RAM and individually tested for compatibility, the new XMS-3200C2 XPERT is guaranteed to run at 400MHz with low latencies of 2-3-3-6. With the growing number of PC games and video-editing applications that benefit from additional system memory, Corsair designed the new XPERT to maximize memory density while minimizing latencies.
There is more info on Corsair’s site.