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48GB (6 X 8GB) DDR3 PC3-10600R 1333MHz CL9 1.5V 2RX4 240PIN DIMMS. THEASE ARE new MODULES AND ARE GUARANTEED TO WORK WITH ALL 2009-2012 APPLE MAC PRO 4,1 AND 5,1 MODELS
***NOTE: The Mac Pro can use either ECC UNBUFFERED or ECC REGISTERED DIMMS, but they cannot be mixed. These are ECC REGISTERED, so remove all UNBUFFERED DIMMS before installing****
This UPGRADE WORKS WITH THE FOLLOWING MODELS
Mac Pro "Quad Core" 2.66 (2009/Nehalem)2.66 GHz Q. Core Xeon W3520
Mac Pro "Quad Core" 2.93 (2009/Nehalem)2.93 GHz Q. Core Xeon W3540
Mac Pro "Quad Core" 3.33 (2009/Nehalem)3.33 GHz Q. Core Xeon W3580
Mac Pro "Eight Core" 2.26 (2009/Nehalem)2.26 GHz Q. Core Xeon E5520 x2
Mac Pro "Eight Core" 2.66 (2009/Nehalem)2.66 GHz Q. Core Xeon X5550 x2
Mac Pro "Eight Core" 2.93 (2009/Nehalem)2.93 GHz Q. Core Xeon X5570 x2
Mac Pro "Quad Core" 2.8 (2010/Nehalem)2.8 GHz Q. Core Xeon W3530
Mac Pro "Quad Core" 3.2 (2010/Nehalem)3.2 GHz Q. Core Xeon W3565
Mac Pro "Six Core" 3.33 (2010/Westmere)3.33 GHz 6 Core Xeon W3680
Mac Pro "Eight Core" 2.4 (2010/Westmere)2.4 GHz Q. Core Xeon E5620 x2
Mac Pro "Twelve Core" 2.66 (2010/Westmere)2.66 GHz 6 Core Xeon X5650 x2
Mac Pro "Twelve Core" 2.93 (2010/Westmere)2.93 GHz 6 Core Xeon X5670 x2
Mac Pro "Quad Core" 3.2 (2012/Nehalem)3.2 GHz Q. Core Xeon W3565
Mac Pro "Six Core" 3.33 (2012/Westmere)3.33 GHz 6 Core Xeon W3680
Mac Pro "Twelve Core" 2.4 (2012/Westmere)2.4 GHz 6 Core Xeon E5645 x2
This memoryhas a lifetime replacement warranty.

SK hynix 48GB (6x8GB) DDR4 SO-DIMM PC4-3200AA 260-Pin Non-ECC RAM
$160.00
2009 Mac Pro 4,1 to 5,1 CPU Tray with 12-Core 3.46GHz Xeon and 48GB (6x 8) RAM
$295.00
48GB (6X 8GB) DDR3-1333 PC3-10600 Memory RAM for APPLE MAC PRO 5,1 Westmere
$69.99
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