EDGE Tech 8GB DDR2 SDRAM Memory Module. 8GB KIT 2X4GB ECC PC2-5300 RDIMM DR SYSTEM X 41Y2768 SYSMEM. 8GB (2 x 4GB) - 667MHz DDR2-667/PC2-5300 - ECC Chipkill - DDR2 SDRAM - 240-pin DIMM