Amazon.com: OWC 32.0GB (4 X 8GB) ram Memory Upgrade kit DDR3 1333 mhz ECC PC 10600 SDRAM ECC, Compatible with 2009-2012 Mac Pro 'Nehalem' & 'Westmere' Models and PC desktops and laptops
A-Tech 1GB DDR3 1333MHz Desktop Memory Module (1 x 1GB) PC3-10600 Non-ECC Unbuffered DIMM 240-Pin 1Rx8 1.5V Single Rank Computer RAM Upgrade Stick at Amazon.com