Simmtec, Inc MemoryMasters 8GB (4X2GB) DDR2 667MHz PC2-5300 ECC FB Dual Rank 2Rx8 FB-DIMM
$50.75
ECC Fully Buffered (an FBDIMM will not fit into a standard DDR2 socket, and a DDR2 module will not fit into an FBDIMM socket)