Kingston ValueRAM 4GB 667MHz DDR2 ECC Fully Buffered CL5 DIMM Quad Rank x8 Desktop Memory 667 Mbps DDR2 Speed Grade VDD = VDDQ = 1.8V DRAM VCC = VCCFBD = 1.5V AMB VDDSPD = 3.3V EEPROM Full DIMM Heat Spreader (FDHS)