AddOn 397415-S21-AM - 8GB DDR2-667MHz Dr FBDIMM F/HP

These parts are FACTORY ORIGINAL Tier 1 modules (from either Samsung Micron Hynix Infineon etc.). You cannot buy a better module and there is a good chance that it is an identical module you may get directly from the OEM. All AddOn modules are built to meet or exceed OEM specifications and JEDEC standards. All memory modules come with a Lifetime warranty and are 100% guaranteed compatible for the appropriate systems it is intended for.