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4.0GB OWC Memory Upgrade

4.0GB PC8500 DDR3 ECC 1066MHz 240 Pin

Used | OWC Tested

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.
*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 8-Core (Mid 2010)
(July, 2010)
Model ID: MacPro5,1
2.4GHz
Mac Pro
Mac Pro (Mid 2010 Quad-Core)
(July, 2010)
Model ID: MacPro5,1
2.8GHz, 3.2GHz, 3.33GHz
Mac Pro
Mac Pro (Early 2009 8-Core)
(March, 2009)
Model ID: MacPro4,1
2.26GHz, 2.66GHz, 2.93GHz
Mac Pro
Mac Pro (Early 2009 Quad-Core)
(March, 2009)
Model ID: MacPro4,1
2.66GHz, 2.93GHz, 3.33GHz
Xserve Intel
Xserve 8-Core (Early 2009)
(April, 2009)
Model ID: Xserve3,1
2.26GHz, 2.66GHz, 2.93GHz
Xserve Intel
Xserve Quad-Core (Early 2009)
(April, 2009)
Model ID: Xserve3,1
2.26GHz
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.
PC Servers
PC Servers
Compatible with Intel / AMD Process based servers capable with the specifications listed above. Memory complies with JEDEC Specifications, document JESD79-3B.

Customer Ratings

Write a Review 4.9 / 5 24 out of 25 (96%) reviewers would recommend this product
1 2 3 4 5
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. Customer Videos:

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. Customer Videos:

Verified Buyer
Reviewer: IAmTheWind Location: Boulder, CO Age: Over 65 Experience Level: Power User Owned Product: less than a month
Rating: 5/5 Gave my 2010 Mac Pro a new lease on life May 21, 2018 My original 10GB of memory was fine for several years but with the onset of processing large files such as RAW images, my beloved mid-2010 Mac Pro had been suffering. The OS X Memory Cleaner app had been indicating up to 99% of used memory and the machine was crawling.

The installation of 32GB of OWC memory speeded up operation of my computer remarkably and Memory Cleaner now usually shows only 30-40% used memory.

I've been a happy OWC customer since 2006 and I'm thinking that my next purchase is likely to be an additional 32GB of memory.

Thanks for the new lease on life, OWC!

I would recommend this item to a friend! This review is from 32.0GB Mac Pro / Xserve 2009 Memory Matched Set (2x 16GB) PC-8500 1066MHz DDR3 ECC SDRAM Modules. Customer Videos:

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. Customer Videos:

Verified Buyer
Reviewer: Bean Location: Marrero. La. Age: 55-65 Experience Level: Home User Owned Product: less than a month
Rating: 5/5 This product provided ease of installation. February 19, 2018 This product provided a memory upgrade that I needed and aided in better performance of my computer.

I would recommend this item to a friend! This review is from 48.0GB Mac Pro / Xserve 2009 Memory Matched Set (3x 16GB) PC-8500 1066MHz DDR3 ECC SDRAM Modules. Customer Videos:

Verified Buyer
Reviewer: CreativeDude Location: Paris, France Age: 35-44 Experience Level: Power User Owned Product: less than a month
Rating: 5/5 Awesome January 4, 2018 My mid-2010 8-core Mac Pro is an audio / video production tool so the 12Gb of RAM it came with were bottlenecking the speed of some tasks. Ordering 64 Gb from OWC was the best decision ever ! The whole experience from ordering to delivery and installing was flawless !

I now have a brand new computer, unexpected for a 7 year-old computer.

I would recommend this item to a friend! This review is from 64.0GB Mac Pro Early 2009 Memory Matched Set (4x 16GB) PC-8500 1066MHz DDR3 ECC SDRAM Modules. Customer Videos:

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. Customer Videos:

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. Customer Videos:

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. Customer Videos:

Verified Buyer Top 250 Contributor
Reviewer: 377Ohm Location: Lausanne, Switzerland Age: 45-54 Experience Level: Power User Owned Product: 1-3 months
Rating: 5/5 Excellent RAM product at a very affordable price December 16, 2017 I have been using this RAM upgrade for over a month in my 2010-vintage Mac Pro, both under macOS 10.12.6 and Win 7. I have experienced no problems whatsoever. In short, this a no-hassle, quality RAM upgrade at a modest, very affordable price. I wholeheartedly recommend the product to all whose "cheese grater" Mac Pro keeps running strong and can benefit from more RAM.

I would recommend this item to a friend! This review is from 128.0GB Mac Pro Early 2009 Memory Matched Set (8x 16GB) PC-8500 1066MHz DDR3 ECC SDRAM Modules. Customer Videos:

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. Customer Videos:

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. Customer Videos:

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. Customer Videos:

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. Customer Videos:

Verified Buyer
Reviewer: MacProlate2009 Location: Indianapolis, IN Age: 45-54 Experience Level: Home User Owned Product: less than a month
Rating: 5/5 Works like a charm July 16, 2017 I probably got more RAM than I will ever need, but then we always say that and then want more a few years later as technology advances. in any event this really sped up my aging Mac Pro for loading and multitasking. I was a little incredulous that it would make this much difference in an old machine - but it i did. I have not had this installed long, so I cannot comment on the durability of this product.

I would recommend this item to a friend! This review is from 128.0GB Mac Pro Early 2009 Memory Matched Set (8x 16GB) PC-8500 1066MHz DDR3 ECC SDRAM Modules. Customer Videos:

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. Customer Videos:
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. Customer Videos:

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. Customer Videos:

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. Customer Videos:

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. Customer Videos:

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. Customer Videos:

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. Customer Videos:

Verified Buyer Top 250 Contributor
Reviewer: Bigdrum Location: Chicago Age: 55-65 Experience Level: Power User Owned Product: 5-6 months
Rating: 5/5 16.0GB Mac Pro / Xserve 2009 Memory Matched Set adds to your Mac! April 5, 2017 My 16.0GB Mac Pro / Xserve 2009 Memory Matched Set helps my Mac run better! Great deal and a great price to keep your Mac running smooth!

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. Customer Videos:

Verified Buyer
Reviewer: hanks Location: Central Oregon Age: Over 65 Experience Level: Power User Owned Product: over 6 months
Rating: 5/5 Excellent Product, Excellent Company February 19, 2017 No problems with the product. Not my first rodeo with MacSales. They are a great company and a pleasure to work with.

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. Customer Videos:

Verified Buyer
Reviewer: DennisNG
Rating: 5/5 The 48 GB Mac Pro for my 2010 work perfectly February 13, 2017 Well, I wish for 64 GB but that is the maximum I can do.

I would recommend this item to a friend! This review is from 48.0GB Mac Pro / Xserve 2009 Memory Matched Set (3x 16GB) PC-8500 1066MHz DDR3 ECC SDRAM Modules. Customer Videos:

OWC Memory 4.0GB 4.0GB PC8500 DDR3 Module Mfr P/N: 8566D3ECC4GB OWC SKU: OWC8566D3ECC4GU OWC Memory Upgrade Kit 1 Year OWC Limited Warranty
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