A-Tech 32GB KIT (4 x 8GB) For Dell Precision Notebook Series Mobile Workstation M4600 Mobile Workstation M6500 (Quad Core) Mobile Workstation M6600 (. SO-DIMM DDR3 NON-ECC PC3-10600 1333MHz RAM Memory at Amazon.com
Corsair Vengeance Pro 32GB (4x8GB) DDR3 1600 MHz (PC3 12800) Desktop, Red 1.5V at Amazon.com