AddOn A2026995-AM RAM Module - Dell® A2026995 Compatible Factory Original 4GB (2x2GB) DDR2 667MHz Fully Buffered ECC Dual Rank 1.8V 240 pin CL5 FBDIMM For Workstation, Server 4 GB (2 x 2GB) DDR2 SDRAM 667 MHz 1.80 V ECC Fully Buffered 240 pin

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.