Apple Mac Pro A1289 MacPro4,1 (Early 2009/Nehalem) Quad Core Intel Xeon W3520 @ 2.66GHz / 3GB of 1066MHz DDR3 SDRAM / 1TB HDD / OS X Mountain Lion / NVIDIA GeForce GT120
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4GB 2X2GB RAM Memory for Apple Mac Pro 2.66GHz Quad-Core Xeon (MB871LL/A) DDR3 UDIMM 240pin PC3-8500 1066MHz Black Diamond Memory Module Upgrade - Walmart.com
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Mac Pro "Quad Core" 2.66 (2009/Nehalem) Specs (Early 2009, MB871LL/A, MacPro4,1, A1289, 2314): EveryMac.com
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