System Architecture

According to an Apple developer note, the system architecture is based on a North Bridge and South Bridge design: The North Bridge has two front-side bus (FSB) connections, one for each processor. The North Bridge also drives one x16 PCI Express (PCIe) link, typically connected to a graphics card. The North Bridge connects to the South Bridge using an Enterprise Southbridge Interface (ESI) and a PCIe link. The South Bridge handles all other connections in the system, including SATA, USB, and networking.^[12]

CPU

All original tower Mac Pro systems were available with one or two central processing units (CPU). As of 2012, there had been models sold with 2, 4, 6, 8, or 12 cores. As an example, the 8-core standard configuration Mac Pro 2010 uses two 4-core Intel E5620 Xeon CPUs at 2.4 GHz,^[8][13] but could be configured with two 6-core Intel Xeon X5670 CPUs at 2.93 GHz.^[14] The 2006–2008 models use the LGA 771 socket, while the Early 2009 and later use the LGA 1366 socket, meaning either can be removed and replaced with compatible 64-bit Intel Xeon CPUs.^[15] A 64-bit EFI firmware was not introduced until the MacPro3,1, earlier models can only operate as 32-bit despite having 64-bit Xeon processors, however this only applies to the EFI side of the System, as the Mac boots everything else in BIOS Compatibility mode, and operating systems can take advantage of full 64 bit support. The newer LGA 1366 sockets utilize Intel's QuickPath Interconnect (QPI) integrated into the CPU in lieu of an independent system bus; this means the "bus" frequency is relative to the CPU chipset, and upgrading a CPU is not bottlenecked by the computer's existing architecture.

Memory

The original Mac Pro's main memory uses 667 MHz DDR2 ECC FB-DIMMs; the early 2008 model uses 800 MHz ECC DDR2 FB-DIMMS, the 2009 and onward Mac Pro use 1066 MHz DDR3 ECC DIMMs for the standard models, and 1333 MHz DDR3 ECC DIMMs for systems configured with 2.66 GHz or faster CPUs.^[16] In the original and 2008 models, these modules are installed in pairs, one each on two riser cards. The cards have 4 DIMM slots each, allowing a total of 32 GB (1 GB = 1024³ B) of memory (8 × 4 GB) to be installed.^[17] Notably, due to its FB-DIMM architecture, installing more RAM in the Mac Pro will improve its memory bandwidth, but may also increase its memory latency.^[18] With a simple installation of a single FB-DIMM, the peak bandwidth is 8000 MB/s (1 MB = 1000² B), but this can increase to 16000 MB/s by installing two FB-DIMMs, one on each of the two buses, which is the default configuration from Apple. While electrically the FB-DIMMs are standard, for pre-2009 Mac Pro models Apple specifies larger-than-normal heatsinks on the memory modules. Problems have been reported by users who have used third party RAM with normal size FB-DIMM heatsinks.^[19] (see notes below). 2009 and later Mac Pro computers do not require memory modules with heatsinks.

Hard drives

The Mac Pro had room for four internal 3.5" SATA-300 hard drives in four internal "bays". The hard drives were mounted on individual trays (also known as "sleds") by captive screws. A set of four drive trays was supplied with each machine. Adding hard drives to the system did not require cables to be attached as the drive was connected to the system simply by being inserted into the corresponding drive slot. A case lock on the back of the system locked the disks trays into their positions. The Mac Pro also supported Serial ATA solid-state drives (SSD) in the 4 hard drive bays via an SSD-to-hard drive sled adapter (mid-2010 models and later), and by third-party solutions for earlier models (e.g., by an adapter/bracket which plugged into an unused PCIe slot). Various 2.5-inch SSD drive capacities and configurations were available as options. The Mac Pro was also available with an optional hardware RAID card.^[20] With the addition of a SAS controller card or SAS RAID controller card, SAS drives could be directly connected to the system's SATA ports. Two optical drive bays were provided, each with a corresponding SATA port and an Ultra ATA/100 port. The Mac Pro had one PATA port and could support two PATA devices in the optical drive bays. It had a total of six SATA ports – four were connected to the system's drive bays, and two were not connected. The extra SATA ports could be put into service through the use of after-market extender cables to connect internal optical drives, or to provide eSATA ports with the use of an eSATA bulkhead connector.^[21] However, the two extra SATA ports were unsupported and disabled under Boot Camp.

Expansion cards

The 2008 model had two PCI Express (PCIe) 2.0 expansion slots and two PCI Express 1.1 slots, providing them with up to 300 W of power in total. The first slot was double wide and intended to hold the main video card, arranged with an empty area the width of a normal card beside it to leave room for the large coolers modern cards often use. In most machines, one slot would be blocked by the cooler. Instead of the tiny screws typically used to fasten the cards to the case, in the Mac Pro a single "bar" held the cards in place, which is itself held in place by two "captive" thumbscrews that can be loosened by hand without tools and will not fall out of the case.

On the original Mac Pro introduced in August 2006, the PCIe slots can be configured individually to give more bandwidth to devices that require it, with a total of 40 "lanes", or 13 GB/s total throughput. When running Mac OS X, the Mac Pro did not support SLI or ATI CrossFire,^[22] limiting its ability to use the latest "high-end gaming" video card products; however, individuals have reported success with both CrossFire and SLI installations when running Windows XP, as SLI and CrossFire compatibility is largely a function of software.

The bandwidth allocation of the PCIe slots can be configured via the Expansion Slot Utility included with Mac OS X only on the August 2006 Mac Pro. The Early-2008 and later Mac Pros had PCIe slots hardwired as in the accompanying table.

External connectivity

For external connectivity, the Mac Pro included five USB 2.0 ports, two FireWire 400 and two FireWire 800 (Late 2006 until Early 2008), respectively four FireWire 800 (Early 2009 until Mid 2012) ports. Networking was supported with two built-in Gigabit Ethernet ports. 802.11 a/b/g/n Wi-Fi support (AirPort Extreme) required an optional module in the Mid 2006, Early 2008 and Early 2009 models, whereas in the 2010 model and later Wi-Fi was standard. Bluetooth also required an optional module in the Mid 2006 model, but was standard in the Early 2008 and newer models. Displays were supported by one or (optionally) more PCIe graphics cards. More recent cards featured two Mini DisplayPort connectors and one dual-link Digital Visual Interface (DVI) port, with various configurations of on-card graphics memory available. Digital (TOSlink optical) audio and analog 3.5 mm stereo mini jacks for sound in and out were included, the latter becoming available on both the front and back of the case. Unlike other Mac computers, the Mac Pro did not include an infrared receiver (required to use the Apple Remote). In Mac OS X Leopard, Front Row could be accessed on the Mac Pro (and other Macs) using the Command (⌘)-Escape keystroke.

Case

From 2006 through 2012, the exterior of the Mac Pro's aluminum case was very similar to that of the Power Mac G5, with the exception of an additional optical drive bay, a new arrangement of I/O ports on both the front and the back, and one less exhaust vent on the back.

The case could be opened by operating a single lever on the back, which unlocked one of the two sides of the machine, as well as the drive bays. All of the expansion slots for memory, PCIe cards and drives could be accessed with the side panel removed and no tools were required for installation.^[23] The Mac Pro's Xeon processors generated much less heat than the previous 2-core G5s, so the size of the internal cooling devices were reduced significantly.

This allowed the interior to be re-arranged, leaving more room at the top of the case and doubling the number of internal drive bays. This also allowed the elimination of the large clear plastic air deflector used as part of the cooling system in the Power Mac G5. Less heat also meant less air to move out of the case for cooling during normal operations; the Mac Pro was very quiet in normal operation, quieter than the much noisier Power Mac G5,^[24] and proved difficult to measure using common sound pressure level meters.^[25] The front of the case, which has small perforated holes across its entire surface area, has caused Macintosh enthusiasts to refer to the first generation as the "cheese grater" Mac Pro.^[26]

Operating systems

The Mac Pro comes with EFI 1.1, a successor to Apple's use of Open Firmware and the wider industry's use of BIOS.^[27]

Apple's Boot Camp provides BIOS backwards compatibility, allowing dual and triple boot configurations. These operating systems are installable on Intel x86–based Apple computers:^[28]

• Mac OS X 10.4.7 and later
• Microsoft Windows XP, Vista, and Windows 7 32-bit & 64-bit (hardware drivers are included in Boot Camp)
• Other x86 operating systems such as Linux x86, Solaris, and BSD

This is made possible by the presence of an x86 Intel architecture as provided by the CPU and the BIOS emulation which Apple has provided on top of EFI.^[28] Installing any additional operating system other than Windows is not supported directly by Apple.^[28] Though Apple's Boot Camp drivers are only for Windows, it is often possible to achieve full or nearly full compatibility with another OS by using third-party drivers.^[28]

Specifications

According to Apple, all of these models are obsolete.^{[lower-alpha 1][29]}

Reception

Ars Technica reviewed the 2006 Mac Pro, calling it a solid "multiplatform device" and rating it 9 out of 10.^[44] CNET praised the design and value, although did not think it provided the flexibility of other systems. They gave it an 8 out of 10.^[45]

Sound on Sound, an audio recording technology magazine, thought it was a "great machine" for musicians and audio engineers.^[46] Architosh, an online architectural design magazine focused on mac technology, would have scored it a perfect five except for a few issues with software compatibility and the high price for FB-DIMM memory.^[47]

Hardware

The redesigned Mac Pro takes up less than one-eighth the volume of the immediately previous model, being shorter at 9.9 inches (25 cm), thinner at 6.6 inches (17 cm) and lighter at 11 pounds (5.0 kg). It supports one central processing unit (CPU) (up to a 12-core Xeon E5 CPU), four 1866 MHz DDR3 slots, dual AMD FirePro D series GPUs (up to D700 with 6 GB VRAM each), and PCIe-based flash storage. There is a 3× MIMO antenna system for the unit's 802.11ac WiFi networking interface, Bluetooth 4.0 to facilitate close-range wireless functions such as music transfer, keyboards, mice, tablets, speakers, security, cameras, and printers. The system can simultaneously support six Apple Thunderbolt Displays, or three 4K resolution computer monitors.^[55]

The cylindrical Mac Pro has a redesigned configuration of ports. It has a HDMI 1.4 port, dual Gigabit Ethernet ports, six Thunderbolt 2 ports, four USB 3 ports, and combined digital Mini-TOSlink optical / analog 3.5 mm stereo mini jack for audio output. It also has a headphones mini jack (the two are distinctly selectable within the Sound System Preference panel, Output tab). There is no dedicated port for inputting audio. The system has a low-fidelity internal mono speaker. The Thunderbolt 2 ports support up to thirty-six Thunderbolt devices (six per port) and can concurrently support up to three 4K displays. This design requires two GPUs to support the seven display outputs (HDMI and six Thunderbolt). The I/O panel illuminates itself when the unit senses it has been moved to make it easier for the user to see the ports. Unlike the previous model, it has no FireWire 800 ports, dedicated digital audio in/out ports, a SuperDrive, DVI port, 3.5-inch drive bays for replaceable storage drives, or changeable internal PCIe slots. Instead, there are six Thunderbolt 2 ports to connect high-speed external peripherals, including enclosures for internal PCIe cards.^[55]

Apple's website mentions only RAM^[56] and flash storage^[57] as user-serviceable, though third party tear-downs show nearly all components can be removed and replaced. However, special tools only available from Apple are necessary for proper dismantling and reassembly.^[58] Apple has also specified mandatory and recommended tightening torque values for nearly every screw, with the most important being those securing the GPUs and CPU riser card to the thermal core.^[59] According to Apple, not tightening screws to the mandatory torque values may result in damage or malfunction.^[60] A lock switch on the aluminum housing allows for easy access to the internals, as well as fitting a security lock with its own cable, and components are secured with Torx screws. The flash storage and GPUs use proprietary connectors and are specially sized to fit into the enclosure.^[61] The CPU is not soldered to the riser card and can be replaced with another LGA 2011 socket processor, including processor options not offered by Apple.^[62] The type of RAM modules that Apple supplies with the late-2013 Mac Pro in the default configuration are ECC unbuffered (UDIMM) on the up to 8 GB modules (shown on each module as PC3-14900E). Apple offers as an optional upgrade 16 GB modules are ECC registered (RDIMM) modules (shown on each module as PC3-14900R). The higher-capacity 32 GB modules that some third-party vendors offer are also RDIMM. The UDIMM and RDIMM module types cannot be mixed. Apple publishes recommended configurations to use.^[63][64]

Operating systems

Apple's Boot Camp provides BIOS backwards compatibility, allowing dual and triple boot configurations. These operating systems are installable on Intel x64-based Apple computers:

• OS X Mavericks and later
• Windows 7, 8.1 and 10 64-bit (hardware drivers are included in Boot Camp)
• Linux via Linux installers (Boot Camp does not provide Linux support in the same way it does with Windows)

Specifications

Reception

Reception of the new design was mixed, initially receiving positive reviews, but more negative in the long term, due to Apple's failure to upgrade the hardware specs. The performance had been widely lauded, especially handling video tasks on the dual GPU units, with some reviewers noting the ability to apply dozens of filters to realtime 4K resolution video in Final Cut Pro X.^[70] Drive performance, connected via PCIe, was also widely mentioned as a strong point. Technical reviewers praised the OpenCL API under which the machine's powerful twin GPUs and its multi-core CPU can be treated as a single pool of computing power. However, in late 2013 through early 2014, some reviewers had noted the lack of internal expandability, second CPU, serviceability, and questioned the then-limited offerings via Thunderbolt 2 ports.^[71][72] By 2016, reviewers started to agree that the Mac Pro was now lacking in functionality and power, it having not been updated since 2013, and it was past time for Apple to update it.^[73] Apple later revealed in 2017 that the thermal core design had limited the ability to upgrade the Mac Pro's GPUs and that a new design was under development, to be released sometime after 2017.^[74]

Problems

On February 5, 2016, Apple identified problems with FirePro D500 and D700 GPUs manufactured between February 8, 2015 and April 11, 2015. Issues included "distorted video, no video, system instability, freezing, restarts, shut downs, or may prevent system start up."^[75] Customers who owned a Mac Pro exhibiting those issues could take their affected machine to Apple or an authorized service provider to have both GPUs replaced for free. The repair program ended on May 30, 2018. Customers who owned Mac Pros with FirePro D300 GPUs also complained about problems, but those GPUs were not included in the repair program until July 2018.^[76] Customers with FirePro GPUs not manufactured between those dates have complained of issues including overheating and thermal throttling.^[77] It is believed Apple has not enabled a satisfactory cooling fan profile in order to properly remove heat from the system. Users have had to resort to using third-party apps to manually increase the fan speed to prevent the GPUs from overheating.^[78]

Design

The 2019 Mac Pro returns to a tower form factor and features a prominent lattice pattern on its front and rear. The lattice design was purportedly originally developed by Jony Ive for the Power Mac G4 Cube in 2000.^[91] It comes bundled with a new Magic Keyboard with black keys in a silver chassis, and a black Magic Mouse 2 or Magic Trackpad 2 with a silver underside.

Reception

Initial reviews were generally positive. The only pre-release review models of the Mac Pro and Pro Display XDR were provided to YouTube tech vloggers Justine Ezarik, Marques Brownlee, and Jonathan Morrison, rather than reviewers from traditional news outlets.^[92]

iFixit gave it a repairability score of 9/10, noting that every part of the machine is user-replaceable. The SSD can also be replaced via Apple official parts, but require an Apple Configurator restore to re-pair it with the T2 chip.^[84][93]

Specifications

Reception

The Verge's review of the Mac Pro praised its performance, saying it "vastly outperforms Intel models from 2019," but criticized the inability to upgrade memory and the lack of support for graphics cards. It also criticized the Mac Pro's $3,000 price premium over a similarly configured Mac Studio with the same performance, with the Mac Pro's only advantage being the addition of PCIe slots.^[104]

YouTuber Marques Brownlee headlined, "Why Does the M2 Mac Pro Exist?", and found the Mac Pro and Mac Studio performed almost identically in testing despite the Mac Pro's much larger cooling system.^[105]

Specifications