KOMPUTERBAY 16GB DDR2-800 FB-DIMM Fully Buffered PC3-6400 DDR2 800Mhz ECC Kit for Apple Mac Pro - Model Id 3,1 - (4x 4GB) ECC Fully Buffered (an FBDIMM will not fit into a standard DDR2 socket, and a DDR2 module will not fit into an FBDIMM socket) Capacity: 16GB For Apple Mac Pro (8-core) Desktop Speed: PC2-6400F 800MHz 240-Pin FBDIMM Fully Buffered Lifetime Warranty