ProLiant ML570 G4 1GB PC2-3200 DDR2 Memory Compaq ProLiant ML570 G4 RAM -1GB 1024MB-400MHz DDR2-400 PC2-3200 240p DIMM ECC Registered 1.8v Single- Rank module (which is required to use full capicity memory for ddr2 systems. Please Order Qty 2 for Dual Channel use.