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OWC Special Offer Available

$70.99 off *NOW* Get Parallels Desktop Pro Edition - Windows/Multi OS Compatibility software for Mac - Only $29.00 with select OWC SSDs, HDDs, Memory, External Storage, and Optical Drives! (Limit 3 rebates, 1 rebate per qualifying item)
Must purchase with: PPDPROSUB1Y-REB29

12.0GB OWC Memory Upgrade Kit

3 x 4.0GB PC8500 DDR3 ECC 1066MHz 240 Pin
OWC Memory Lifetime Limited Warranty including Advanced Replacement Program |
30 Day Money Back Guarantee
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.
- Please allow up to 14 Days from the time we receive your memory for testing and rebate processing.
- The OWC Rebate is for up to the same number of memory modules purchased and must be in working order.
*About the Apple Specified Thermal Sensor:
Ensuring maximum performance, reliability, and operational feedback -this DDR3 ECC Modules for the Apple Mac Pro 'Nehalem' 4 Core/8-Core and 'Westmere' 6-Core/8-Core processor models feature utilization of Apple qualified components including the inclusion of the Apple qualified Thermal Sensor EEPROM.
Please Note:
Memory modules may differ in appearance from those pictured.
This OWC Memory is compatible with... Learn how to find your Mac's model ID or PC specs
Mac Pro
Mac Pro 12-Core (Mid 2012)
(June, 2012)
Model ID: MacPro5,1
2.4GHz, 2.66GHz, 3.06GHz
Detailed specs
Install Videos
Mac Pro
Mac Pro 6-Core (Mid 2012)
(June, 2012)
Model ID: MacPro5,1
3.33GHz
Detailed specs
Install Videos
Mac Pro
Mac Pro 4-Core (Mid 2012)
(June, 2012)
Model ID: MacPro5,1
3.2GHz
Detailed specs
Install Videos
Mac Pro
Mac Pro 12-Core (Mid 2010)
(July, 2010)
Model ID: MacPro5,1
2.66GHz, 2.93GHz
Detailed specs
Install Videos
Mac Pro
Mac Pro 8-Core (Mid 2010)
(July, 2010)
Model ID: MacPro5,1
2.4GHz
Detailed specs
Install Videos
Mac Pro
Mac Pro 6-Core (Mid 2010)
(July, 2010)
Model ID: MacPro5,1
3.33GHz
Detailed specs
Install Videos
Mac Pro
Mac Pro 4-Core (Mid 2010)
(July, 2010)
Model ID: MacPro5,1
2.8GHz, 3.2GHz
Detailed specs
Install Videos
Mac Pro
Mac Pro 8-Core (Early 2009)
(March, 2009)
Model ID: MacPro4,1
2.26GHz, 2.66GHz, 2.93GHz
Detailed specs
Install Videos
Mac Pro
Mac Pro 4-Core (Early 2009)
(March, 2009)
Model ID: MacPro4,1
2.66GHz, 2.93GHz, 3.33GHz
Detailed specs
Install Videos
PC Desktop
PC Desktops
Compatible with Intel / AMD Process based PCs capable with the specifications listed above. Memory complies with JEDEC Specifications, document JESD79-3B.

Customer Ratings

Write a Review 4.9 / 5 114 out of 119 (96%) reviewers would recommend this product
1 2 3 4 5
Verified Buyer
Reviewer: PoisedFirefly-70863
Rating: 5/5 Fun upgrade June 2, 2021 My Mac had 8GB for years. Finally upgrading made a big difference. My big projects open so much faster now.

I would recommend this item to a friend! This review is from 64.0GB Mac Pro Early 2009 Memory Matched Set (8x 8GB) PC-8500 1066MHz DDR3 ECC SDRAM Modules.

Verified Buyer
Reviewer: FineScorpion-20058
Rating: 5/5 Excellent June 1, 2021 The website was very clear about what memory was compatible with my mac. It arrived in the mail quickly, and my computer is running fantastically.

I would recommend this item to a friend! This review is from 64.0GB Mac Pro Early 2009 Memory Matched Set (8x 8GB) PC-8500 1066MHz DDR3 ECC SDRAM Modules.

Verified Buyer
Reviewer: johnthomasgraves
Rating: 5/5 Works great! May 7, 2021 Simple, easy, works, done!

I would recommend this item to a friend! This review is from 16.0GB Mac Pro / Xserve 2009 Memory Matched Set (2x 8GB) PC-8500 1066MHz DDR3 ECC SDRAM Modules.

Verified Buyer
Reviewer: SuperNewt-79980
Rating: 5/5 Memory April 28, 2021 Easy plug and play, worked like a charm

I would recommend this item to a friend! This review is from 16.0GB Mac Pro / Xserve 2009 Memory Matched Set (2x 8GB) PC-8500 1066MHz DDR3 ECC SDRAM Modules.

Verified Buyer Top 250 Contributor
Reviewer: Artysan Location: Fort Lauderdale, FL Age: 55-65 Experience Level: IT Professional Owned Product: over 6 months
Rating: 5/5 My only place for Mac RAM August 24, 2020 For MacPro 4,1, since converted to 5,1 and traded with new processor. Always flawless performance and excellent shopping experience.

I would recommend this item to a friend! This review is from 24.0GB Mac Pro / Xserve 2009 Memory Matched Set (3x 8GB) PC-8500 1066MHz DDR3 ECC SDRAM Modules.

Verified Buyer
Reviewer: Shoboshi
Rating: 5/5 Works perfectly August 15, 2020 This review is from 32.0GB Mac Pro Early 2009 Memory Matched Set (4x 8GB) PC-8500 1066MHz DDR3 ECC SDRAM Modules.
Verified Buyer
Reviewer: Hamjac Location: Québec, QC, Canada Age: Over 65 Experience Level: Home User Owned Product: less than a month
Rating: 5/5 Just great! July 28, 2019 Order arrived home on last Thursday July 25. Installed yesterday evening July 27 upgrading original 2 X 2 Go. Works great the first time. Tried to load the RAM with many apps at the same time and it just ran fantastic. Tks for a nice product.

JH.

I would recommend this item to a friend! This review is from 16.0GB Mac Pro / Xserve 2009 Memory Matched Set (2x 8GB) PC-8500 1066MHz DDR3 ECC SDRAM Modules.

Verified Buyer
Reviewer: wakeupscreaming
Rating: 5/5 Works great for Mac Pro Six Core Mid-2010 Westmere October 4, 2018 I bought a matched set (2x8GB) for my Mac Pro Mid 2010 3.46 GHz 6 Six Core Westmere. I've had the RAM now for more than a year with no issues. I have a total of 20GBs RAM, with 2x2GB in the other 2 slots.

I tried to find information on the maximum RAM for this Mac Pro model, and it's a little confusing. It's either 32GB or 48GB?

I would recommend this item to a friend! This review is from 16.0GB Mac Pro / Xserve 2009 Memory Matched Set (2x 8GB) PC-8500 1066MHz DDR3 ECC SDRAM Modules.

Response from OWC, Call Center October 9, 2018 Hello! The maximum RAM for the 6-core MacPro would be 48GB using 3x16GB sticks!
Verified Buyer
Reviewer: MacMANNewYorK Location: NEW YORK, NY Age: 35-44 Experience Level: Home User Owned Product: 3-4 months
Rating: 5/5 So Far So Good July 2, 2018 This 64gb Memory is pretty good for my 2009 Mac Pro Quad Core. Im satisfied so far. Hope they last a very long time!

I would recommend this item to a friend! This review is from 64.0GB Mac Pro Early 2009 Memory Matched Set (8x 8GB) PC-8500 1066MHz DDR3 ECC SDRAM Modules.

Verified Buyer
Reviewer: kneegrowe223 Location: New Zealand
Rating: 5/5 Great product! June 7, 2018 easy to install, and instantly felt the difference. thanks for the quick delivery for your New Zealand customers!

I would recommend this item to a friend! This review is from 32.0GB (8x 4GB) DDR3 ECC PC8500 1066MHz SDRAM ECC for Mac Pro & Xserve 'Nehalem' models.

Verified Buyer
Reviewer: waynekhin Location: Singapore
Rating: 5/5 Keeps my old 2013 Mac Pro running perfectly. April 23, 2018 Max out the available slots with this set of SDRAM Modules. The pretty old Mac Pro is now running perfectly.

I would recommend this item to a friend! This review is from 32.0GB Mac Pro Early 2009 Memory Matched Set (4x 8GB) PC-8500 1066MHz DDR3 ECC SDRAM Modules.

Verified Buyer
Reviewer: SalamanderJSH Age: 55-65 Experience Level: Power User Owned Product: 1-3 months
Rating: 5/5 Powerful upgrade January 2, 2018 I bought these for a power and speed upgrade to my Mac Pro. Works great.

I would recommend this item to a friend! This review is from 8.0GB (2x 4GB) DDR3 ECC PC8500 1066MHz SDRAM ECC for Mac Pro & Xserve 'Nehalem' models.

Verified Buyer Top 50 Contributor
Reviewer: JimTheBrewer Location: Cape Canaveral, FL Experience Level: Power User Owned Product: 1-3 months
Rating: 5/5 More memory = more better December 17, 2017 Good memory, fast.

I would recommend this item to a friend! This review is from 16.0GB (4x 4GB) DDR3 ECC PC8500 1066MHz SDRAM ECC for Mac Pro & Xserve 'Nehalem' models.

Verified Buyer Top 50 Contributor
Reviewer: JimTheBrewer Location: Cape Canaveral, FL Experience Level: Power User Owned Product: 1-3 months
Rating: 5/5 Perfect replacement, easy install. December 17, 2017 More useable memory, enough said.

I would recommend this item to a friend! This review is from 32.0GB Mac Pro Early 2009 Memory Matched Set (4x 8GB) PC-8500 1066MHz DDR3 ECC SDRAM Modules.

Verified Buyer
Reviewer: carcassolas
Rating: 5/5 Super happy November 25, 2017 The product was super quick to arrive at my home and it works without a problem. Recommend :)

I would recommend this item to a friend! This review is from 48.0GB Mac Pro / Xserve 2009 Memory Matched Set (6x 8GB) PC-8500 1066MHz DDR3 ECC SDRAM Modules.

Verified Buyer
Reviewer: Loco Location: Lausanne, Switzerland Age: 55-65 Experience Level: Power User Owned Product: 1-3 months
Rating: 5/5 So far so good October 24, 2017 Just installed the 32Gb ram and works perfectly well.

I would recommend this item to a friend! This review is from 32.0GB Mac Pro Early 2009 Memory Matched Set (4x 8GB) PC-8500 1066MHz DDR3 ECC SDRAM Modules.

Verified Buyer
Reviewer: PhntmRob Location: NY Age: 55-65 Experience Level: Power User Owned Product: less than a month
Rating: 5/5 Upgraded 2010 Mac Tower with RAM from MacSales September 22, 2017 I have an Mid 2010 Mac Pro tower and wanted to upgrade the RAM. Now have 24G Ram in my machine and it really made a difference speed.

I would recommend this item to a friend! This review is from 16.0GB Mac Pro / Xserve 2009 Memory Matched Set (2x 8GB) PC-8500 1066MHz DDR3 ECC SDRAM Modules.

Verified Buyer
Reviewer: bizpat Location: nc Age: Over 65 Experience Level: Power User Owned Product: less than a month
Rating: 5/5 From 8 to 32BG September 4, 2017 I boosted my older 2009 Mac Pro from 8 to 32 with these 4 sticks. A local store said I couldn't do that but it worked just fine. I had to upgrade because I had added a second monitor to my system and it was pulling too much memory and causing slow web loading. Easy peasy to install.

I would recommend this item to a friend! This review is from 32.0GB Mac Pro Early 2009 Memory Matched Set (4x 8GB) PC-8500 1066MHz DDR3 ECC SDRAM Modules.

Verified Buyer
Reviewer: Quixote
Rating: 5/5 Product worked beautifully July 11, 2017 I would recommend this item to a friend! This review is from 32.0GB Mac Pro Early 2009 Memory Matched Set (4x 8GB) PC-8500 1066MHz DDR3 ECC SDRAM Modules.
Verified Buyer Top 250 Contributor
Reviewer: Kuko Location: Calgary Age: Over 65 Experience Level: Power User Owned Product: over 6 months
Rating: 5/5 Mac Pro 2009 June 19, 2017 Works flawlessly, A+

I would recommend this item to a friend! This review is from 4.0GB Mac Pro Early 2009 Memory Matched Set (2x 2GB) PC-8500 1066MHz DDR3 ECC SDRAM Modules.

Verified Buyer
Reviewer: DesignsByJonathan Location: SW FL Age: 45-54 Experience Level: Power User Owned Product: 1-3 months
Rating: 5/5 Superfast 64 GB RAM upgrade June 6, 2017 Superfast 64 GB RAM upgrade on a Mac Pro 4,1 tower. Fast delivery, great price, like new machine handles video even better now. User error on install (RAM was not firmly seated correctly by me) and MacSales talked me through it. Highly recommended!

THANKS!

I would recommend this item to a friend! This review is from 64.0GB Mac Pro Early 2009 Memory Matched Set (8x 8GB) PC-8500 1066MHz DDR3 ECC SDRAM Modules.

Verified Buyer
Reviewer: MAC24X7 Location: El Dorado Hills, CA Age: Over 65 Owned Product: less than a month
Rating: 5/5 Always Dependable June 4, 2017 A client has an older Mac Pro quad-core tower server working flawlessly since new. I upgraded the RAM to the max of 16, up from the 6GB it shipped with. Also replaced the enterprise drives with SSDs. In a FileMaker server role, it is spectacular, serving up 8 million records. OWC always comes through. Been doing business with them forever.

This review is from 4.0GB DDR3 ECC PC8500 1066MHz SDRAM ECC for Mac Pro & Xserve 'Nehalem' models.

Verified Buyer
Reviewer: JayRally Age: 35-44 Experience Level: Power User Owned Product: less than a month
Rating: 5/5 Perfect. May 4, 2017 I always order my RAM from MacSales.com. They always have quality products and I've never been disappointed with them.

I would recommend this item to a friend! This review is from 8.0GB (2x 4GB) DDR3 ECC PC8500 1066MHz SDRAM ECC for Mac Pro & Xserve 'Nehalem' models.

Verified Buyer
Reviewer: Dra45 Age: 45-54 Experience Level: Hobbiest Owned Product: 1-3 months
Rating: 5/5 Great memory April 19, 2017 The memory came on time,and I installed it in my 2009 Mac Pro in less than 5 minutes.It worked out great.

I would recommend this item to a friend! This review is from 32.0GB Mac Pro Early 2009 Memory Matched Set (4x 8GB) PC-8500 1066MHz DDR3 ECC SDRAM Modules.

Verified Buyer
Reviewer: JackRecorder Location: Rhode Island Age: Over 65 Experience Level: Power User Owned Product: 1-3 months
Rating: 5/5 Always delivers as expected! April 12, 2017 Hard to write a review on a product that works when installed and just keeps on working! Always pleased with anything from MacSales and encourage colleagues to shop there! Dependable to the max!

I would recommend this item to a friend! This review is from 32.0GB Mac Pro Early 2009 Memory Matched Set (4x 8GB) PC-8500 1066MHz DDR3 ECC SDRAM Modules.

OWC Memory 12.0GB 3 x 4.0GB PC8500 DDR3 Kit Mfr P/N: 85MP3W4M12GK OWC SKU: OWC85MP3W4M12GK OWC Memory Upgrade Kit Lifetime OWC Limited Warranty Ships: Pending
Reviews (119)
Only $77.97Matched Kit for $69.99
Add to CartOther World Computing 85MP3W4M12GK, Click to Buy Now
Additional Capacities & Kits: 1 x Module (Single)
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