Corsair XMS2 Xtreme Performance - 1GB DDR2 800MHz PC2-6400 CL5

Since mid-2003, Corsair has been involved with DDR2 development through the JEDEC association, which establishes industry standards for electronics. Its participation has allowed Corsair to be among the first companies to reach the market with DDR2 memory modules. Corsair is calling the family XMS2. Initial product offerings will look similar to the classic XMS memory.
This memory significantly outperforms the fastest DDR speeds. DDR2 speed grades START where DDR hit the ceiling.
Guaranteed standards- compliant! Corsair is a member of JEDEC and helped define DDR2 standards.
Better signal integrity provides higher clock speeds thanks to new features at chip level, such as Off-Chip Driver calibration (OCD) and On-Die Termination (ODT).
The memory features larger 4-bit prefetch, additive latency, and enhanced registers.