HP 397415-B21 Compatible Factory Original 8GB (2x4GB) DDR2-667MHz Fully Buffered ECC Dual Rank 1.8V 240-pin CL5 FBDIMM - For Workstation - 8 GB (2 x 4GB) DDR2 SDRAM - 667 MHz - 1.80 V - ECC - Fully Buffered - 240-pin - DIMM - Lifetime Warranty

HP 397415-B21 Compatible Factory Original 8GB (2x4GB) DDR2-667MHz Fully Buffered ECC Dual Rank 1.8V 240-pin CL5 FBDIMM - For Workstation - 8 GB (2 x 4GB) DDR2 SDRAM - 667 MHz - 1.80 V - ECC - Fully Buffered - 240-pin - DIMM - Lifetime Warranty