New OCZ PC2-6400 4GB kits are the world's first 4GB NVIDIA nForce SLI Certified kits and are designed for ultimate gaming performance on NVIDIA nForce motherboards. The new OCZ PC2-6400 4GB SLI-Ready Series is equipped with NVIDIA Enhanced Performance Profiles (EPP) to optimize the modules' gaming performance on nForce SLI-based motherboards. Designed to deliver exceptional memory performance with the latest DX10 games OCZ exclusively has engineered select high-performance 4GB memory SLI kits with advanced SPD (Serial Presence Detect) settings to allow compatible motherboards to recognize and utilize the added information, ultimately increasing the performance potential of the entire platform.