Hyper X 2GB 800MHz DDR2 Low-Latency CL4 (4-4-4-12) DIMM (NVIDIA SLI-Ready)...Standard 128M X 64 Non-ECC 800MHz 240-pin Unbuffered DIMM (SDRAM-DDR2, 2.0V, CL4, Gold). Kingston's KHX6400D2LLK2/2GN is a kit of two low-latency 128M x 64-bit 1GB (1024MB) DDR2-800 CL4 SDRAM (Synchronous DRAM) memory modules that are NVIDIA SLI-Ready. Both modules are based on sixteen 64M x 8-bit DDR2 FBGA components. Total kit capacity is 2GB (2048MB). Each module pair has been tested to run at DDR2 800MHz at low latency timing of 4-4-4-12 at 2.0V. The SPD is programmed to JEDEC standard latency 800Mhz timing of 5-5-5-15-2T at 1.9V. Each 240-pin DIMM uses gold contact fingers and requires +1.8V. Modules are intended for use with NVIDIA SLI certified solutions.