Server Memory and Hardware Compatibility | Crucial.com
A-Tech 8GB Kit (2 x 4GB) Server RAM for HP Compaq Workstation xw6400, xw6600, xw8400, xw8600 | DDR2 667MHz PC2-5300F ECC Fully Buffered DIMM Server Memory Kit at Amazon.com
Kingston ValueRAM 8GB DDR3 1333MHz DIMM Desktop Server Memory at Amazon.com