A-Tech 24GB Kit (6 x 4GB) for DELL Precision T3500 (3500) Workstation Desktop Tower - 240-Pin UDIMM DDR3 ECC Unbuffered 2Rx8 1.5V PC3-10600 1333MHz Dual Rank Server RAM Memory at Amazon.com
CMS 24GB (3X8GB) DDR3 10600 1333MHZ ECC Registered DIMM Memory Ram Upgrade Compatible with HP/Compaq® Workstation Z600 C2 Series Only Ecc Reg for Server Only - B105 at Amazon.com
Silicon Power DDR3 16GB (2 x 8GB) 1600MHz (PC3 12800) 240-pin CL11 1.35V / 1.5V Unbuffered UDIMM PC Computer Desktop Memory Module Ram Upgrade at Amazon.com
Corsair Apple Certified 16 GB (2x8 GB) DDR3 1600MHz (PC3 12800) Laptop Memory 1.35V at Amazon.com