4GB 2 X 2GB PC2-5300 667MHz 240 pin DDR2 SDRAM ECC DIMM Desktop Server Memory for Dell PowerEdge R200 (PARTS-QUICK BRAND) Capacity: 4GB 2 X 2GB Kit Form Factor: 240 pin DIMM Warranty: Lifetime ONLY FOR THE SERVER LISTED DO NOT BUY FOR STANDARD DESKTOPS WHICH USE NON-ECC MEMORY