Full Details from Amazon.com : http://www.amazon.com/gp/product/B007PNAQW2?tag=onigi-20
Komputerbay 16GB (8x 2GB) DDR2 PC2-5300F 667MHz CL5 ECC Fully Buffered 2Rx4 FB-DIMM (240 PIN)
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 32GB For Apple Mac Pro 8-core Desktop
Speed PC2-5300F 667MHz
240-Pin DIMM
Lifetime Warranty