KOMPUTERBAY 8GB (4X2GB) Certified Memory for HP PROLIANT DL160 G5 484060-B21 (DDR2 800MHz PC2-6400 FB) 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: 8GB Speed: PC2-6400F 800MHz 240-Pin FBDIMM Fully Buffered Lifetime Warranty