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4.0GB OWC Memory Upgrade Kit

Matched pair, perfect for the Mac Pro 8-core / Quad-core Xeon systems!
Memory Image
Product Specs:
OWC Memory for Mac Pro Quad Xeon fully meets Apple's specifications with special attention to proper thermal specifications.
Memory Trade in
Save money by trading in your original chips! View available memory rebates.
From the purchase date of qualifying memory from OWC, you have 60 days to trade-in your old memory for a cash rebate!
Just fill out OWC's online rebate form or contact OWC Customer Service after you receive and install your new memory.
OWC is proud to offer the best possible Mac Pro Memory solutions available.
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Pictured above: Proper Apple Qualified heat-spreaders.
See the difference between
Apple's qualified modules and those that are not!
Premium Quality Modules fully Mac Pro Qualified and backed by OWC Memory Lifetime Limited Warranty including Advanced Replacement Program.

These OWC memory modules fully meet/exceed Apple's Mac Pro Quad & 8-Core Xeon model memory specifications. Utilization of qualified Apple Mac Pro Heat-Spreaders, Apple Qualified IDT AMBs, and the best major brand memory components ensure maximum performance and trouble-free operation. Modules are fully tested prior to shipment.


Apple specifically designed the Mac Pro with more space between each slot to accommodate the Apple Proprietary Heat-Spreader for thermal requirements. Use of Apple's spreader solution and the highest grade, thermally tolerant components ensure that these Mac Pro Quad Xeon Memory Upgrade Kits will provide a lifetime of reliable and trouble-free operation.

Apple notes that using parts with a non-Apple standard heat-spreader and which only meet JEDEC standard specifications can result in higher fan speeds due to increased internal temperatures and system controlled reduction of memory performance to prevent thermal overload. OWC's testing has found that use of non Apple qualified spec modules leads to ECC errors and ultimate system lock ups as non-spec modules reach significantly higher temperatures.

Two well known memory manufacturers originally listed their own JEDEC standard modules as being Mac Pro compatible. Within days of doing so, each removed this compatibility support after reports and testing which made clear JEDEC standard modules were not reliable in the Mac Pro. It is very disappointing that many other memory providers continue to list and misrepresent such JEDEC modules (lacking the proper heat-spreader) as being correct for the Mac Pro.

The Apple Mac Pro is an amazing machine. Memory from OWC only makes it better!
This OWC Memory is compatible with... Learn how to find your Mac's model ID or PC specs
Mac Pro
Mac Pro (8-core)
(April, 2007)
Model ID: MacPro2,1
3.0GHz
Mac Pro
Mac Pro
(August, 2006)
Model ID: MacPro1,1
2.0GHz, 2.66GHz, 3.0GHz

Customer Ratings

Write a Review 5 / 5 7 out of 7 (100%) reviewers would recommend this product
Verified Buyer
Reviewer: Anonymous Age: 55-65 Experience Level: Power User Owned Product: over 6 months
Rating: 5/5 Having the right product for my Mac September 4, 2015 Thank you for being mac friendly

I would recommend this item to a friend!

Verified Buyer Top 250 Contributor
Reviewer: Anonymous Location: Norway Age: 55-65 Experience Level: Home User Owned Product: 1-3 months
Rating: 5/5 Very Satisfied May 2, 2015 I am very satisfied with my purchased from OWC, can absolute recomend others from buing with OWC

I would recommend this item to a friend!

Verified Buyer
Reviewer: Anonymous Location: New York, NY Age: 55-65 Experience Level: IT Professional Owned Product: less than a month
Rating: 5/5 Easy to snap in April 14, 2015 I recently ordered the 4 GB Mac Pro Memory (2GBx2) DDR2, 667MHz 240 pin. Before installing these chip boards I disconnected my Power Mac and gently vacuumed the inside as best I could. You don't want to seat theses chips with dust in the pin holes. I noted these newer chips having a better built quality and beefier look that my older ones. Then I added in the new chip boards in which they snapped in easily. I closed the Mac back up reconnected the cables and I was good to go. I work in Abobe suite 5.5 (mostly Photoshop) the extra memory is just what I needed to get through a rather large job I was working on. Everything worked so much better and faster. Most important, the job was sent out on time.

I would recommend this item to a friend!

Verified Buyer
Reviewer: Anonymous Location: Saint-Petersburg, Russia. Age: 25-34 Experience Level: Power User Owned Product: less than a month
Rating: 5/5 works well! March 15, 2013 Great Product ! Work with Mac Pro Quad Core 2.66 kHz

I would recommend this item to a friend!

Reviewer: JustPoet Location: California Age: 25-34 Experience Level: IT Professional Owned Product: over 6 months
Rating: 5/5 Care Free Reliability November 29, 2011 I've had OWC memory in many of my systems over many years, with most of my systems running close to 24/7, and never had an issue.

This set (I got 2 to make it 4x 2GB) went into my MacPro 2,1 8x3Ghz system and has been rock steady for several years now.

I would recommend this item to a friend!

Verified Buyer
Reviewer: Kmell Location: The Netherlands Age: 35-44 Experience Level: Power User Owned Product: less than a month
Rating: 5/5 Very good experience August 16, 2011 I ordered Mac pro memory. Memory is working fine and super fast delivery service to Europe (in less than 4 days including weekend)! Perfect!

I would recommend this item to a friend!

Verified Buyer Top 250 Contributor
Reviewer: harryb2448 Location: Nambucca Heads Australia Age: Over 65 Experience Level: Power User Owned Product: over 6 months
Rating: 5/5 Lifetime Warranty Works! April 29, 2011 July 2009 purchased a matched pair of OWC memory modules for my Mac Pro based on competitive pricing and postage costs to Australia. Never thought for one minute would need replacement under the lifetime guarantee. Then this year Apple System Profiler reports only half the memory capacity with no memory in Riser B.

Advised OWC and received email with identification code. Air mailed back to OWC and seven days later two brand new replacement modules arrive in Australia. Fourteen day turn around from date of complaint. Unbelievable service thanks OWC!

I would recommend this item to a friend!

OWC Memory 4.0GB 2 x 2.0GB Kit PC5300 DDR2 Mfr P/N: 53FB2MPK04GB MacSales.com SKU: OWC53FB2MPK04GB OWC Memory Upgrade Kit Lifetime OWC Limited Warranty Ships: Same Day Only $45.98Matched Kit for $39.99
Add to CartOther World Computing 53FB2MPK04GB In Stock, Click to Buy Now