OCZ NVIDIA SLI-Ready Edition 240-pin DIMM DDR2 PC2-8500, 1066MHz 2GB (2 x 1GB) SDRAM unbuffered dual channel system memory kit; Cas 5; CL 5-5-5-15 timings; 2.1V volts; XTC (Xtreme Thermal Convection) Edition NVIDIA SLI heatspreader included. 2.4V EVP (E)xtended (V)oltage (P)rotection. NVIDIA nForce SLI certified. 100% hand tested. Lifetime warranty.