KOMPUTERBAY 4GB (2GBx2) 240-pin DIMM DDR2 PC2-5300 CL=5 1.8V 256Meg x 72 Memory Kit 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