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HP 16GB (4 x 4GB) DDR2-667 MHz PC2-5300F FBDIMM– Cloud Ninjas
16GB 4x4GB PC2-6400 DDR2-800MHz Non-Ecc 240Pin DIMM AMD CPU Desktop Memory at Amazon.com
HP 16GB 2X 8GB PC2-5300 DDR2-667 2Rx4 ECC Fully Buffered FBDIMM Memory Kit (HP PN# 413015-B21) at Amazon.com