| Component | Intel Xeon (based onCore microarchitecture) | Intel Xeon (based on Nehalem microarchitecture) | Intel Xeon (based onNehalem microarchitectureand Westmere microarchitecture) | 
| Model | Mid 2006 | Early 2008 | Early 2009 | Mid 2010 | Mid 2012 | 
| Release date | August 7, 2006 April 4, 2007Optional 3.0 GHz Quad-core Xeon "Clovertown"
 | January 8, 2008 | March 3, 2009 December 4, 2009Optional 3.33 GHz Quad-core Xeon "Bloomfield"
 | August 9, 2010 | June 11, 2012 | 
| Model Numbers | MA356*/A | MA970*/A | MB871*/A MB535*/A | MC560*/A MC250*/A MC561*/A | MD770*/A MD771*/A MD772*/A | 
| Machine Model | MacPro1,1 MacPro2,1Optional 3.0 GHz Quad-core Xeon "Clovertown"
 | MacPro3,1 | MacPro4,1 | MacPro5,1 | MacPro5,1 | 
| EFI Mode | EFI32 | EFI64 | 
| Kernel Default Mode | 32-bit | 32-bit in Mac OS X (client), 64-bit in Mac OS X Server | 64-bit | 
| Chipset | Intel 5000X | Intel 5400 | Intel X58 | 
| Processor | Two 2.66 GHz (5150) Dual-core Intel Xeon "Woodcrest" Optional 2.0 GHz (5130), 2.66 GHz or 3.0 GHz (5160) Dual-core or 3.0 GHz (X5365) Quad-core Intel Xeon "Clovertown"
 | Two 2.8 GHz (E5462) Quad-Core Intel Xeon "Harpertown" Optional two 3.0 GHz (E5472) or 3.2 GHz (X5482) Quad-core processors or one 2.8 GHz (E5462) Quad-core processor
 | One 2.66 GHz (W3520) Quad-Core Intel Xeon "Bloomfield" or two 2.26 GHz (E5520) Quad-core Intel Xeon "Gainstown" with 8 MB of L3 cache Optional 2.93 GHz (W3540) or 3.33 GHz (W3580) Intel Xeon Quad-core Intel Xeon "Bloomfield" processors or two 2.66 GHz (X5550) or 2.93 GHz (X5570) Quad-core Intel Xeon "Gainstown" processors
 | One 2.8 GHz Quad-Core "Bloomfield" Intel Xeon (W3530) processor with 8 MB of L3 cache or two 2.4 GHz Quad-Core "Gulftown" Intel Xeon (E5620) processors with 12 MB of L3 cache or two 2.66 GHz 6-core "Gulftown" Intel Xeon (X5650) processors with 12 MB of L3 cache Optional 3.2 GHz Quad-Core "Bloomfield" (W3565) or 3.33 GHz 6-core "Gulftown" (W3680) Intel Xeon processors or two 2.93 GHz 6-core (X5670) Intel Xeon "Gulftown" processors
 | One 3.2 GHz Quad-Core Intel Xeon (W3565) processor with 8 MB of L3 cache or two 2.4 GHz 6-Core Intel Xeon (E5645) processors with 12 MB of L3 cache Optional 3.33 GHz 6-Core (W3680), two 2.66 GHz 6-core (X5650), or two 3.06 GHz 6-core (X5675) Intel Xeon processors
 | 
| System bus | 1333 MHz | 1600 MHz | 4.8 GT/s(Quad-core models only) or 6.4 GT/s | 4.8 GT/s(Quad-core models only), 5.86 GT/s(8-core models only) or 6.4 GT/s | 4.8 GT/s(Quad-core models only), 5.86 GT/s(12-core models only) or 6.4 GT/s | 
| Front-side bus | QuickPath Interconnect | 
| Memory | 1 GB (two 512 MB) of 667 MHz DDR2 ECC fully buffered DIMM Expandable to 16 GB (Apple), 32 GB (Actual)
 | 2 GB (two 1 GB) of 800 MHz DDR2 ECC fully buffered DIMM Expandable to 32 GB
 | 3 GB (three 1 GB) for UP quad-core or 6 GB (six 1 GB) for DP 8-core of 1066 MHz DDR3 ECC DIMM Expandable to 16 GB on Quad-core models (although expandable to 32GB using 3rd party 4×8GB DIMMS), and 32 GB in 8-core models
 | 3 GB (three 1 GB) for quad- and 6-core models or 6 GB (six 1 GB) for 8- and 12-core models Expandable to 32 GB on Quad-core models, and 64 GB in 8- and 12-core models (although expandable to 96GB using 3rd party 6×16GB DIMMS)
 | 6 GB (three 2 GB) for quad- and 6-core models or 12 GB (six 2 GB) for 12-core models Expandable to 32 GB on Quad- and 6-core models, and 64 GB in 12-core models (although expandable to 96GB using 3rd party 6×16GB DIMMS)
 | 
| Graphics Expandable to four graphics cards
 | nVidia GeForce 7300 GT with 256 MB of GDDR3 SDRAM (single-link and dual-link DVI ports) Optional ATI Radeon X1900 XT with 512 MB GDDR3 SDRAM (two dual-link DVI ports) or nVidia Quadro FX 4500 with 512 MB GDDR3 SDRAM (stereo 3D and two dual-link DVI ports)
 | ATI Radeon HD 2600 XT with 256 MB of GDDR3 SDRAM (two dual-link DVI ports) Optional nVidia GeForce 8800 GT with 512 MB GDDR3 SDRAM (two dual-link DVI ports) or nVidia Quadro FX 5600 1.5 GB (stereo 3D, two dual-link DVI ports)
 | nVidia GeForce GT 120 with 512 MB of GDDR3 SDRAM (one mini-DisplayPort and one dual-link DVI port) Optional ATI Radeon HD 4870 with 512 MB of GDDR5 SDRAM (one Mini DisplayPort and one dual-link DVI port)
 | ATI Radeon HD 5770 with 1 GB of GDDR5 memory (two Mini DisplayPorts and one dual-link DVI port) Optional ATI Radeon HD 5870 with 1 GB of GDDR5 memory (two Mini DisplayPorts and one dual-link DVI port)
 | 
| Hard drive 7200-rpm unless specified
 | 250 GB Serial ATA with 8 MB cache Optional 500 GB with 8 MB cache or 750 GB with 16 MB cache
 | 320 GB Serial ATA with 8 MB cache Optional 500 GB, 750 GB, or 1 TB Serial ATA with 16 MB cache or 300 GB Serial Attached SCSI, 15,000-rpm with 16 MB cache
 | 640 GB Serial ATA with 16 MB cache Optional 1 TB or 2 TB Serial ATA drives with 32 MB cache
 | 1 TB Serial ATA with 32 MB cache Optional 1 TB or 2 TB Serial ATA drives with 32 MB cache or 512 GB Solid State Drives
 | 
| Optical drive | 16× SuperDrive with double-layer support (DVD±R DL/DVD±RW/CD-RW) | 18× SuperDrive with double-layer support (DVD±R DL/DVD±RW/CD-RW) | 
| AirPort Extreme | Optional 802.11a/b/g and draft-n (n disabled by default) | Optional 802.11a/b/g and draft-n (n-enabled) | Built-in 802.11a/b/g/n | 
| Maximum Supported Operating System | OS X 10.7 "Lion" (Unofficially, can run OS X 10.8 "Mountain Lion" with an upgrade to a supported graphics card and EFI64 emulation)
 | OS X 10.8 "Mountain Lion" | 
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