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Silver Tower Mac Pro Q&A - Updated October 9, 2013

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Dec 18, 2019 Subscribe to the MacRumors YouTube channel for more videos. The base model ‌Mac Pro‌ ships with 32GB 2933MHz RAM, but the machine supports up to 1.5TB and has a total of 12 DIMM slots.
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How do you upgrade the RAM in the 'Early 2008' (Harpertown/Penryn) Mac Pro? What type of RAM does it use? How much RAM does it actually support? Is it backwards compatible with RAM from the original Mac Pro?

Please note that this Q&A explains how to upgrade the RAM in the 'Early 2008' Mac Pro models (model identifier MacPro3,1).

EveryMac.com also provides RAM upgrade instructions for other Mac Pro models -- the original Mac Pro (MacPro1,1 and MacPro2,1), 'Early 2009' (MacPro4,1), and 'Mid-2010' and 'Mid-2012' (MacPro5,1) systems.

Just like the original Mac Pro models, installing RAM in the 'Early 2008' Mac Pro line -- the Mac Pro 'Quad Core' 2.8, 'Eight Core' 2.8, 'Eight Core' 3.0, and 'Eight Core' 3.2 -- is an easy procedure, but it is important that the memory meet exacting standards and be installed in a particular way to function properly.

Photo Credit: Apple, Inc. (Early 2008 Mac Pro)

Identification Help

If you're not sure if you have an 'Early 2008' Mac Pro or another model, the A1186Model Number is insufficient as this identifier is shared by the original Mac Pro models, which use a different type of RAM.

However, for the purposes of upgrading the RAM, the 'Early 2008' Mac Pro models can be uniquely identified by the Model Identifier in software and externally by EMC Number. More information about specific identifiers is provided in EveryMac.com's detailed Mac Identification section.

To locate the model identifier, select 'About This Mac' under the Apple Menu on your computer and click the 'More Info..' button. If the Mac Pro is running OS X 'Lion' (10.7) or later, click the 'System Report' button after clicking 'More Info..' as well. Regardless of the number of cores, all 'Early 2008' Mac Pro models share model identifier MacPro3,1.

The EMC number is located on the rear of the system in small type. As carefully hand documented by EveryMac.com, all 'Early 2008' Mac Pro models share EMC number 2180.

Specifically, the following systems are 'Early 2008' Mac Pro models:

Mac Pro	Subfamily	Model ID	EMC Number
Early 2008
Early 2008
Early 2008
Early 2008

EveryMac.com's Ultimate Mac Lookup feature -- as well as the EveryMac app -- also can identify these models by their Serial Numbers.

RAM Type & Actual Maximum Capacity

Officially, the 'Early 2008' Mac Pro requires '800MHz DDR2 ECC fully buffered DIMM (FB-DIMM) memory', but more precisely, the memory must meet these exact specifications:

800 MHz, DDR2, FB-DIMMs
72-bit wide, 240-pin modules
36 memory ICs maximum per DIMM
Error-correcting code (ECC)

However, the always excellent BareFeats also discovered that the 'Early 2008' Mac Pro line is capable of using 667 MHz FB-DIMMs that are compatible with the original Mac Pro, albeit at a 'maximum penalty of 4% in speed.'

Apple also reports that 'DIMMs must be installed in matched pairs.' There are eight FB-DIMM slots in total on two 'riser cards' (four slots per card) that officially can hold 32 GB of RAM.

More recently, though, site sponsor OWCcertified that the 'Early 2008' Mac Pro models actually can use as much as 64 GB of RAM using eight high-density 8 GB memory modules.

RAM Upgrade Instructions

Detailed information is printed on the inside of the door of the Mac Pro, and this is likely to be sufficient for many users. Apple provides a PDF version with photos of these instructions, too.

However, perhaps even better, site sponsor Other World Computing also provides a step-by-step video of the process:

From watching the above video, it is clear that upgrading the RAM in the Mac Pro is easy. However, if you do not feel comfortable -- or have the time -- to upgrade the RAM yourself, professional installation never is a bad idea.

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Mac Pro RAM Purchase & Professional Installation Options

Just because RAM meets the minimum listed criteria does not mean that it will necessarily function as intended in your Mac. Be sure to buy from a quality vendor that has tested their RAM with the Mac Pro to ensure full compatibility.

In the US (and many other countries), site sponsor Other World Computing sells memory compatible with all Mac Pro models (and all other Macs).

In the UK and Ireland, site sponsor Flexx sells Mac Pro compatible memory with free shipping. The company provides flat rate shipping to France, Germany, and Switzerland and inexpensive shipping for all of Europe, too.

In Canada, site sponsor CanadaRAM sells memory for all Mac Pro models with guaranteed compatibility, fast shipping, and no customs.

In Germany, site sponsor CompuRAM sells quality memory for all Mac Pro models with affordable delivery country-wide and in person pick up and professional installation service available in Munich.

In Australia, site sponsor RamCity sells Mac Pro compatible memory with a lifetime warranty and fast, flat-rate shipping Australia-wide.

In Southeast Asia, site sponsor SimplyMac.sg sells Mac Pro compatible memory with free delivery -- and optional upgrade service -- in Singapore and free shipping to Brunei, Hong Kong, Macau, Malaysia, Myanmar, New Zealand, the Philippines, South Korea, Taiwan, Thailand and Vietnam.

Also see:

How do you upgrade the RAM in the original Mac Pro? What type of RAM does it use? How much RAM does it actually support?
How do you upgrade the RAM in the 'Early 2009/Nehalem' Mac Pro? What type of RAM does it use? How much RAM does it actually support?
How do you upgrade the RAM in the 'Mid-2010' and 'Mid-2012' (Nehalem/Westmere) Mac Pro models? What type of RAM do these models use? How much RAM do they actually support?

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Silver Tower Mac Pro Q&A - Updated May 21, 2013

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How do you upgrade the RAM in the original Mac Pro? What type of RAM does it use? How much RAM does it actually support?

Please note that this Q&A explains how to upgrade the RAM in the original Mac Pro models (model identifiers MacPro1,1 and MacPro2,1).

EveryMac.com also provides RAM upgrade instructions for subsequent Mac Pro models -- the 'Early 2008' (MacPro3,1), 'Early 2009' (MacPro4,1), and 'Mid-2010' and 'Mid-2012' (MacPro5,1) systems.

Installing RAM in the original Mac Pro models is a simple procedure, but it is important to purchase the exact memory needed by the system and install it correctly for optimum performance. These systems also can use more RAM than is officially supported, too.

Photo Credit: Apple, Inc. (Mac Pro)

Identification Help

If you're not sure if you have an original Mac Pro or a later model, the A1186Model Number is insufficient as this identifier is shared by the subsequent 'Early 2008' line, which supports a different type of RAM.

However, for the purposes of upgrading the RAM, the original Mac Pro models can be properly identified by the Model Identifier in software and externally by EMC Number. More details about specific identifiers are provided in EveryMac.com's extensive Mac Identification section.

To locate the model identifier, select 'About This Mac' under the Apple Menu on your computer and click the 'More Info..' button. If the Mac Pro is running OS X 'Lion' (10.7), click the 'System Report' button after clicking 'More Info..' as well. The original Quad Core Mac Pro models are model identifier MacPro1,1 and the Mac Pro 'Eight Core' 3.0 (2,1) is model identifier MacPro2,1.

The EMC number is located on the rear of the system in small type. As carefully hand documented by EveryMac.com, the original Quad Core Mac Pro models -- the Mac Pro 'Quad Core' 2.0, 'Quad Core' 2.66, and 'Quad Core' 3.0 -- are EMC number 2113 and the Mac Pro 'Eight Core' 3.0 (2,1) is EMC number 2138.

Sydney casino. EveryMac.com's Ultimate Mac Lookup feature -- as well as the EveryMac app -- also can identify these models by their Serial Numbers.

RAM Type & Actual Maximum Capacity

In basic terms, all original Mac Pro models require '667 MHz DDR2 ECC fully-buffered DIMM (FB-DIMM) memory', but more precisely, Apple states that the memory must meet these specifications:

667 MHz, FB-DIMMs
72-bit wide, 240-pin modules
36 devices maximum per DIMM
Error-correcting code (ECC)

Each FB-DIMM has its own chip called an 'Advanced Memory Buffer' (AMB) and 'heatsinks on either side'. Some less expensive versions of FB-DIMM memory do not have heatsinks that meet Apple's minimum standards for use in the Mac Pro. According to Apple, the 'Clovertown Eight Core' Mac Pro is even more strict regarding memory standards (although the company no longer provides specific documentation).

Apple also reports that 'DIMMs must be installed in pairs of equal size from the same vendor.' There are eight FB-DIMM slots in total on two 'riser cards' (four slots per card) that can officially hold 16 GB of RAM. However, third-parties have determined that the original Mac Pro models actually can support 32 GB of memory using eight 4 GB modules that meet the same precise standards.

RAM Upgrade Instructions

As is printed on the inside of the door of the Mac Pro, FB-DIMMs must be installed in a particular order.

The default configuration shipped with a pair of 512 MB FB-DIMMs installed in the first and second slots (towards the 'gold fingers' in the top riser card), which leaves six slots free. The next pair of FB-DIMMs must be installed in the first and second slots of the bottom riser card, the next pair in the remaining slots of the top riser card (slots three and four), and finally the last pair in the last two slots (three and four) of the bottom riser card.

If the instructions on the inside of the door are insufficient, Apple provides a PDF version of the instructions as well. Perhaps even better, though, Apple Specialist CityMac provides a step-by-step video of the process:

From watching the above video, it is clear that the RAM installation procedure is simple. However, if you do not feel comfortable -- or have the time -- to upgrade the RAM yourself, professional installation never is a bad idea.