KOMPUTERBAY 4GB 667MHz DDR2 ECC Fully Buffered CL5 DIMM Dual Rank x4 Intel Validated Desktop Memory ECC Fully Buffered (an FBDIMM will not fit into a standard DDR2 socket, and a standard DDR2 module will not fit into an FBDIMM socket) Capacity: 4GB (2X 2GB) Speed: PC2-5300F 667MHz CL 5 Thermal Heatspreaders for Cooling 240-Pin FBDIMM Fully Buffered Lifetime Warranty