**KHX6400D2LLK2/4G 4GB (2GB 256M x 64-Bit x 2 pcs.) PC2-6400 CL4 240-Pin DIMM Kit** Kingstons KHX6400D2LLK2/4G is a kit of two low-latency 256M x 64-bit 2GB (2048MB) DDR2- 800 CL4 SDRAM (Synchronous DRAM) memory modules, based on sixteen 128M x 8-bit DDR2 FBGA components per module. Total kit capacity is 4GB (4096MB). Each module pair has been tested to run at DDR2 800 M Hz at low latency timing of 4-4-4-12 at 1.95V. The SPD is programmed to JEDEC standard latency 667 Mhz timing of 5-5-5-15 at 1.8V. Each 240-pin DIMM uses gold contact fingers & requires +1.8V.