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CMS 16GB (4X4GB) DDR3 10600 1333MHZ ECC Non Registered DIMM Memory Ram Upgrade Compatible with HP/Compaq® Workstation Z820 1333Mhz Ecc Unbuff for Server Only - B126 at Amazon.com
16 GB 4x4GB DDR3 PC3-12800U 1600MHZ NON ECC UNBUFFERED 240 PIN PC RAM WARRANTY | eBay