Micron 4GB PC2-6400P DDR2 Reg ECC MT36HTF51272PZ-80EH1 at Amazon.com
CMS 4GB (2X2GB) DDR2 6400 800MHZ ECC Non Registered DIMM Memory Ram Upgrade Compatible with Dell® Poweredge 840 Ddr2 Ecc Non Reg for Server Only - B65 at Amazon.com
4GB DDR2 Memory Ram, PC2-6400 PC3-12800R 32GB DDR2 800MHZ PC Memory Ram 240Pin Module Board for Desktop Computer, for AMD at Amazon.com
Komputerbay 8 GB (2 x 4GB) PC2-6400 DDR2-800 SoDIMM Dual Channel Laptop Memory Kit at Amazon.com
CMS 4GB (2X2GB) DDR2 3200 400MHZ ECC Registered DIMM Memory Ram Upgrade Compatible with Dell® Poweredge 860 Ddr2 Ecc Non Reg for Server Only - B69 at Amazon.com