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Amazon.com: OWC 128GB (4 x 32GB) PC10600 DDR3 ECC-R 1333MHz DIMMs Memory Compatible with Mac Pro Late 2013 Models (OWC1333D3Z3M128) : Everything Else
OWC 32GB (2 x 16GB) PC10600 DDR3 ECC-R 1333MHz DIMMs Memory Compatible with Mac Pro Early 2009 & Late 2010 'Nehalem' & 'Westmere' Systems and Early 2009 Xserve. (OWC85MP3S9M032K) at Amazon.com
RAM OWC 4GB Buy in Multples PC3-10600 1333MHz DDR3 ECC SDRAM 240-pin – Mac PC | eBay
OWC 32.0GB (4X 8GB) DDR3 ECC-R PC10600 1333MHz SDRAM ECC Compatible with Mac Pro (OWC1333D3X8M32K) at Amazon.com
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V7 8GB DDR3 PC3-10600 - 1333mhz 1.35V SERVER ECC REG Server Memory Module - V7106008GBR
Kingston 2GB 1333MHZ DDR3 ECC REG W/PAR at Amazon.com
371-4518 Sun 1GB DDR3 ECC PC3-10600 1333Mhz 1Rx8
RAM Kingston Modules 8x 8GB PC3-10600 1333MHz DDR3 ECC SDRAM 240-pin / Mac or PC | eBay
0R1P74 Dell 4GB DDR3 ECC PC3-10600 1333Mhz 2Rx8
OWC 64.0GB (4X 16GB) PC10600 DDR3 ECC-Registered 1333MHz 240 Pin Memory Upgrade Compatible with Select 2009-2012 Mac Pro Models (OWC1333D3X9M064) at Amazon.com
OWC 32.0GB (2X 16GB) PC10600 DDR3 ECC-R 1333MHz 240 Pin Memory Upgrade Compatible with Select 2009-2012 Mac Pro Models (OWC1333D3X9M032) at Amazon.com
Kingston ValueRAM 16GB 1333MHz DDR3 PC3-10666 ECC Reg CL9 DIMM DR x4 Server Memory KVR13R9D4/16 at Amazon.com