OCZ TECHNOLOGY OCZ2B10664GK 4GB DDR2 PC2-6400/ 800MHz Blade Series Dual Channel Kits (Black) Pure Aluminum Heatsink/ 2.15V EVP* 1066MHz DDR2 / Unbuffered CL 5-5-5-18 2.1 Volts/240 Pin DIMM Available in 4GB (2x2048MB)Dual Channel Optimized Kits