12GB kit (4GBx3), 240-pin DIMM, DDR3 PC3-12800 Memory Module - 12 GB (3 x 4 G at Amazon.com
CMS 12GB (3X4GB) DDR3 12800 1600MHz Non ECC DIMM Memory Ram Upgrade Compatible with Dell® Optiplex 7010 - C59 at Amazon.com
CMS 12GB (3X4GB) DDR3 10600 1333MHZ ECC Registered DIMM Memory Ram Upgrade Compatible with HP/Compaq® Workstation Z600 C2 Seires Only Ddr3 Ecc Reg for Server Only - C20 at Amazon.com