Kingston ValueRAM 3GB 1333MHz DDR3 Non-ECC CL9 DIMM (Kit of 3) Desktop Memory at Amazon.com
Amazon.com: OWC 16GB (2 X 8GB) DDR3 1333MHz 240-pin DIMM ECC Memory Compatible with Mac Pro 2009-2012 'Nehalem' & 'Westmere' Models (OWC1333D3W8M16K) : Everything Else
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Kingston Value RAM 4GB 1333MHz PC3-10600 DDR3 Non-ECC CL9 SODIMM SR X8 Notebook Memory (KVR13S9S8/4) at Amazon.com
8GB Server Memory, 8GB PC3 10600R DDR3 1333MHZ 2Rx4 ECC REG 240Pin Computer Memory Components Server Ram Support Dual/Single CPU Motherboard at Amazon .com