OCZ have just announced the world's first 4GB "NVIDIA SLI Certified" memory kit, these being DDR2 modules rated to run at 800MHz with timings of 5-4-4.
These modules earn their certification by using NVIDIA Enhanced Performance Profiles (EPP) which is said to optimize the modules' gaming performance on nForce SLI-based motherboards.
For further information you can read up on the press material at OCZ's website.
Sunnyvale, CA-October 9, 2007-OCZ Technology Group, Inc., a worldwide leader in innovative ultra-high performance and high reliability memory, today announced the latest addition to the award-winning OCZ NVIDIA® SLI™ certified series, the world's first 4GB PC2-6400 SLI-Ready DDR2 modules. Optimized specifically for the latest generation nForce platforms, this series features an ideal combination of reduced latencies and high density to support the ultimate gaming experience.