4GB RAM Memory Upgrade for HP Compaq ProLiant MicroServer N40L PC3-10600E DDR3 1333MHz 2Rx8 ECC Unbuffered UB DIMM Module (PARTS-QUICK BRAND) Capacity: 4GB DDR3 1333MHz 10600 ECC Unbuffered CAS 9 Form Factor: 240 pin DIMM Warranty: Lifetime ONLY FOR THE SERVER LISTED DO NOT BUY FOR STANDARD DESKTOPS WHICH USE NON-ECC MEMORY