Full Details from Amazon.com : http://www.amazon.com/gp/product/B005HIWDFK?tag=onigi-20
Komputerbay 16GB (4x 4GB) DDR2 PC2-6400F 800MHz ECC Fully Buffered FB-DIMM (240 PIN) 16 GB
ECC Fully Buffered an FBDIMM will not fit into a standard DDR2 socket and a DDR2 module will not fit into an FBDIMM socket
Mac Pro 2008 early 2008 4-core 8-core 28Mhz 30Mhz 32MHz Second Generation 314
Speed PC2-6400F 800MHz DDR2 800MHz PC2-6400F
Apple Approved Heat Shields Certified Mac Pro memory DIMMs must be installed in matching pairs240-Pin DIMM
Lifetime Warranty