CMS 16GB (4x4GB) DDR3 10600 1333MHZ Non ECC DIMM Memory Ram Upgrade Compatible with Dell® Optiplex 980 DDR3 DIMM - C58 at Amazon.com
CMS 16GB (2X8GB) DDR3 10600 1333MHZ ECC Non Registered DIMM Memory Ram Upgrade Compatible with Dell® Precision Workstation T1600 EccNr for Server Only - B87 at Amazon.com
Kingston Value RAM 4GB 1333MHz PC3-10600 DDR3 Non-ECC CL9 SODIMM SR X8 Notebook Memory (KVR13S9S8/4) at Amazon.com
Xtremeram Apple Compatible Memory Module 8GB 1333MHz DDR3 (PC3-10600) - 2x4GB at Amazon.com