Kingston Memory - 1 GB - DIMM 240-pin - DDR II (KTH-XW4200AN/1G) at Amazon .com
1GB PC3200 400MHz 184 pin DDR SDRAM ECC DIMM Server Memory RAM for HP Compaq X Gaming GX5000Z Series.(PARTS-QUICK Brand) Equivalent to HP Part Numbers: DG152A, 354563-B21. at Amazon.com