Full Details from Amazon.com : http://www.amazon.com/gp/product/B000JQV8HE?tag=onigi-20
Kingston ValueRAM 8GB 667MHz DDR2 ECC Fully Buffered CL5 DIMM (Kit of 2) Dual Rank x4 Server
Specifically designed and tested for compatibility in various makes and models of Servers
8 GB kit including two 4 GB modules of 667MHz DDR2 Server Memory
From the industry leader in PC memory
240-pin fully buffered DIMM
Backed by a lifetime warranty and free technical support