![Amazon.com: OWC 48GB (6 x 8GB) PC8500 DDR3 ECC-R 1066MHz DIMMs for 8 Core or Better Mac Pro Early 2009 & Late 2010 'Nehalem' & 'Westmere' Systems & Early 2009 Xserve (OWC85MP3S8M48GK) : Everything Else Amazon.com: OWC 48GB (6 x 8GB) PC8500 DDR3 ECC-R 1066MHz DIMMs for 8 Core or Better Mac Pro Early 2009 & Late 2010 'Nehalem' & 'Westmere' Systems & Early 2009 Xserve (OWC85MP3S8M48GK) : Everything Else](https://m.media-amazon.com/images/I/91NbixdKl6L.jpg)
Amazon.com: OWC 48GB (6 x 8GB) PC8500 DDR3 ECC-R 1066MHz DIMMs for 8 Core or Better Mac Pro Early 2009 & Late 2010 'Nehalem' & 'Westmere' Systems & Early 2009 Xserve (OWC85MP3S8M48GK) : Everything Else
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
Apple Mac Pro A1289 MacPro4,1 (Early 2009/Nehalem) Eight Core Intel Xeon 2x: E5520 @ 2.26GHz / 12GB DDR3 SDRAM / 2TB Seagate ST2000DM006 HDD / OS X Mountain Lion / ATI Radeon HD 5770
![Mac Pro "Quad Core" 2.66 (2009/Nehalem) Specs (Early 2009, MB871LL/A, MacPro4,1, A1289, 2314): EveryMac.com Mac Pro "Quad Core" 2.66 (2009/Nehalem) Specs (Early 2009, MB871LL/A, MacPro4,1, A1289, 2314): EveryMac.com](https://everymac.com/images/cpu_pictures/apple_mac_pro_2009.jpg)