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Silver Tower Mac Pro (Dual Optical) Q&A - Updated October 9, 2013
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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 A1186 Model 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 |
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Early 2008 |
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Early 2008 |
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Early 2008 |
EveryMac.com's Ultimate Mac Lookup feature 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 OWC certified 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.
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.
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 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 Upgradeable sells Mac Pro compatible memory with fast shipping, a money-back guarantee, and more.
In New Zealand, site sponsor Upgradeable New Zealand sells Mac Pro memory with fast delivery to all corners of the country, precise compatibility, a lifetime warranty, and a money-back guarantee.
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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