ValueRAM’s KVR667D2S4F5K2/4G is a kit of two 2GB (256M x 72-bit) PC2-5300 CL5 SDRAM (Synchronous DRAM) “fully buffered” ECC “single rank” memory modules. Total kit capacity is 4GB (4096MB). Each module is based on eighteen 256M x 4-bit 667MHz DDR2 FBGA components. Each module also includes an AMB device (Advanced Memory Buffer). The electrical and mechanical specifications are as follows