CMS 4GB (2X2GB) DDR2 5300 667MHZ ECC Non Registered DIMM Memory Ram Upgrade Compatible with Dell® Poweredge T105 Ecc Unbuff for Server Only - B64 at Amazon.com
Crucial 8GB Kit (4GBx2) DDR2-667MHz (PC2-5300) CL5 Fully Buffered ECC FBDIMM Server Memory CT2KIT51272AF667 / CT2CP51272AF667 at Amazon.com
8GB Kit 2 X 4GB DDR2 Server Memory Upgrade for HP Workstation XW6600 SDRAM ECC Fully Buffered FB DIMM PC2-5300 240 pin 667MHz RAM (PARTS-QUICK Brand) at Amazon.com