Corsair CMZ12GX3M3A1600C9 12GB DDR3 SDRAM Memory Module at Amazon.com
Crucial 12GB DDR3 SDRAM Memory Module (CT3KIT51272BB1339) at Amazon.com
A-Tech 12GB KIT (3 x 4GB) for DELL Precision T3500 (3500) Workstation Desktop Tower - DDR3 PC3-10600 1333MHz 240-Pin UDIMM 2Rx8 1.5V ECC Unbuffered Dual Rank Server RAM Memory at Amazon.com
12GB kit (4GBx3), 240-pin DIMM, DDR3 PC3-12800 Memory Module - 12 GB (3 x 4 G
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