IBM Chipkill PC2-5300 DDR2 512MB DIMM Memory Module 39M5781 at Amazon.com
Micron 4GB FBDIMM Cache Mem ECC MT36HTF51272FZ-667H1D6 657900-001 PC2-5300F DDR2 at Amazon.com
HP RAM 2GB Kit Samsung 2 x 1GB 2RxB PC2-5300F-555-11-B0 Server Ram 398706-051 with Heat spreaders at Amazon.com
4GB 2 X 2GB PC2-5300F 667MHz 240 pin DDR2 SDRAM ECC Fully Buffered FB DIMM Server Low Power Memory for HP Workstation XW8600 (PARTS-QUICK BRAND). Equivalent to HP Part Numbers: 397413-B21, 442823-B21,