4GB 2 X 2GB DDR Memory Upgrade for HP Compaq ProLiant ML150 G2 PC2700 Registered 333 MHz 184 pin SDRAM ECC DIMM RAM (PARTS-QUICK BRAND) Capacity: 4GB Total 2 x 2GB Speed: PC2700 333 MHz DDR Form Factor: 184 pin DIMM Halogen Free; ROHS Warranty: Lifetime