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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

16.0GB OWC Memory Upgrade Kit

4 x 4.0GB PC10600 DDR3 ECC-Registered 1333Mhz / 1066MHz 240 Pin
30 Day Money Back Guarantee | Lifetime Advance Replacement Warranty
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.
IMPORTANT OWC NOTE:
OWC p/n OWC8566D3MPE4GB 4GB modules require that all installed modules be of this same matching part. Other existing Apple or 3rd party 1GB, 2GB and 4GB modules are not supported for use with this kit and need to be removed when this kit is added.
*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.
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
Xserve Intel
Xserve 8-Core (Early 2009)
(April, 2009)
Model ID: Xserve3,1
2.26GHz, 2.66GHz, 2.93GHz
Detailed specs
Xserve Intel
Xserve Quad-Core (Early 2009)
(April, 2009)
Model ID: Xserve3,1
2.26GHz
Detailed specs
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 5 / 5 6 out of 7 (86%) reviewers would recommend this product
Verified Buyer
Reviewer: HeyAnt Location: Greenbelt. MD Age: 35-44 Experience Level: Power User Owned Product: 1-3 months
Rating: 5/5 Solid and reliable September 4, 2020 This is actually my first purchase from OWC. I am very pleased with the performance it has on my Mac Pro. Additionally, I am more pleased with the warranty of their products. I highly recommend their products and their services! Thank you OWC! I'm spreading the word!

I would recommend this item to a friend! This review is from 16.0GB PC10600 DDR3 ECC-R 1333MHz SDRAM for Mac Pro & Xserve 'Nehalem' & 'Westmere' Models.

Verified Buyer
Reviewer: wbg10 Location: Denton, TX Age: Over 65 Experience Level: Power User Owned Product: 1-3 months
Rating: 5/5 Nice Boost to Memory July 31, 2020 Recently upgraded my MacPro which also made it possible to bump up the physical RAM. Glad I did. Enjoying the increased capacity. Matched perfectly with the same size modules I'd purchased from OWC Macsales several year ago. Thanks.

I would recommend this item to a friend! This review is from 16.0GB PC10600 DDR3 ECC-R 1333MHz SDRAM for Mac Pro & Xserve 'Nehalem' & 'Westmere' Models.

Verified Buyer
Reviewer: Sergey7084 Location: Moscow, Russia Age: 45-54 Experience Level: Power User Owned Product: less than a month
Rating: 5/5 It's just a reliable memory July 29, 2020 It's just a reliable memory - you put it in and it just works and you don't notice it.

I would recommend this item to a friend! This review is from 128.0GB (8x 16GB) PC10600 DDR3 ECC-Registered 1333MHz SDRAM for Mac Pro 'Nehalem' & 'Westmere' Models.

Verified Buyer Top 250 Contributor
Reviewer: D4ZZs Location: MN Age: Over 65 Experience Level: Power User Owned Product: 1-3 months
Rating: 5/5 Helped my 2010 MacPro July 3, 2020 2010 MacPro with 64 GB RAM and multiple programs open would periodically get "Run out of application memory" message. Purchased this 128 GB upgrade & no more such messages. (MacPro is 10 years old, but still my workhorse!)

I would recommend this item to a friend! This review is from 128.0GB (8x 16GB) PC10600 DDR3 ECC-Registered 1333MHz SDRAM for Mac Pro 'Nehalem' & 'Westmere' Models.

Verified Buyer
Reviewer: MACsRULE Location: Pennsylvania Age: 55-65 Experience Level: Home User
Rating: 5/5 My Computer ZOOMS! February 18, 2020 Thank You OWC for letting us know that these 16 GB RAM chips will work in my Mid-2010 quad core (intel) Mac Pro! i now have these 3 modules installed and it's like having a new computer! i am VERY VERY happy!

I would recommend this item to a friend! This review is from 48.0GB (3x 16GB) PC10600 DDR3 ECC-R 1333MHz SDRAM ECC for Mac Pro 'Nehalem' & 'Westmere' Models.

Verified Buyer
Reviewer: RAREMuZIK Location: Nashville, TN Age: 55-65 Experience Level: Power User Owned Product: over 6 months
Rating: 5/5 I am a Mac newbie... appreciate your service December 27, 2019 Great quality product... awesome shipping!! I have more several more Macs that are in need of upgrading. I've placed another order today and it's shipped already. Incredible... Thanks

I would recommend this item to a friend! This review is from 32.0GB (2x 16GB) PC10600 DDR3 ECC-Registered 1333MHz SDRAM ECC-Registered for Mac Pro 'Nehalem' & 'Westmere' Models.

Verified Buyer
Reviewer: bitnaut Location: Vancouver, Canada Age: 45-54 Experience Level: Power User Owned Product: less than a month
Rating: 5/5 Works great! October 22, 2018 Works great in my Mac Pro 5,1...no errors like I was getting with the last memory sticks I bought from a competitor.

Thanks OWC!

I would recommend this item to a friend! This review is from 48.0GB (3x 16GB) PC10600 DDR3 ECC-R 1333MHz SDRAM ECC for Mac Pro 'Nehalem' & 'Westmere' Models.

Verified Buyer
Reviewer: DroiddProductions Location: Toronto, Canada Age: 35-44 Experience Level: Power User Owned Product: 1-3 months
Rating: 5/5 Mac Pro 5.1 Phoenix! September 11, 2018 This ram kit took my mid 2010 Mac Pro from being an obsolete paper wieght into 2018. I need to mention that I also upgraded my dual processors to Xeon x5690’s at 3.46ghz and threw in a 500gb ssd for the boot volume. These inexpensive upgrades saved me thousands of dollars. My machine is insanely fast now. Thank you OWC for providing quality products at great prices. You are my go to site for Mac hardware.

I would recommend this item to a friend! This review is from 128.0GB (8x 16GB) PC10600 DDR3 ECC-Registered 1333MHz SDRAM for Mac Pro 'Nehalem' & 'Westmere' Models.

Verified Buyer
Reviewer: MrDennis Location: Los Angeles Age: Over 65 Experience Level: Power User Owned Product: over 6 months
Rating: 5/5 64GBs August 6, 2018 It's What you need if your trying to breath NEW LIFE into your Mac Pro. Helps to get you up and running smoothly. Thanks OWC......

I would recommend this item to a friend! This review is from 64.0GB (4x 16GB) PC10600 DDR3 ECC-Registered 1333MHz SDRAM for Mac Pro 'Nehalem' & 'Westmere' Models.

Verified Buyer
Reviewer: OJFL
Rating: 5/5 Kit well built June 6, 2018 This kit is very well built and very easy to install. The packaging is excellent.

This review is from 128.0GB (8x 16GB) PC10600 DDR3 ECC-Registered 1333MHz SDRAM for Mac Pro 'Nehalem' & 'Westmere' Models.

Verified Buyer
Reviewer: Carls708 Location: Louisiana Age: Over 65 Experience Level: Home User Owned Product: less than a month
Rating: 5/5 Worked perfectly! March 25, 2018 The Mac Pro was sluggish working with large image files, and the increased memory solved the problem. We went from 12 to 96 gigabytes, and the performance increase was dramatic. The memory upgrade actually arrive a day early, which we appreciated.

I would recommend this item to a friend! This review is from 96.0GB (6x 16GB) PC10600 DDR3 ECC-Registered 1333MHz SDRAM for Mac Pro 'Nehalem' & 'Westmere' Models.

Verified Buyer
Reviewer: Unixjedi Location: Trophy Club,TX Age: 45-54 Experience Level: IT Professional Owned Product: over 6 months
Rating: 5/5 no issues, it memory December 4, 2017 Not real hip on doing reviews on mundane items. OWC memory has always been good and good value. Never had a fault. Apple will always give the "need to be Apple Memory" line but OWC is fine and is same or better.

I would recommend this item to a friend! This review is from 64.0GB (4x 16GB) PC10600 DDR3 ECC-Registered 1333MHz SDRAM for Mac Pro 'Nehalem' & 'Westmere' Models.

Verified Buyer
Reviewer: Saeedphoto Location: Dubai Age: 35-44 Experience Level: Power User Owned Product: 1-3 months
Rating: 5/5 Big deal June 27, 2017 128 GB is a big deal, I used to have 64 GB memory from Samsung which was great but after installing 128GB my computer runs photoshop and lightroom much faster and almost everything is noticeably faster.

I would recommend this item to a friend! This review is from 128.0GB (8x 16GB) PC10600 DDR3 ECC-Registered 1333MHz SDRAM for Mac Pro 'Nehalem' & 'Westmere' Models.

Verified Buyer
Reviewer: JFNJ123 Location: Montclair, NJ Age: 45-54 Experience Level: IT Professional Owned Product: less than a month
Rating: 5/5 works perfectly! Great for running multiple VMs June 12, 2017 I am a software engineer running primarily windows (!!) on my 2010 5,1 Mac Pro. I do all of my development in windows under VMware Fusion, running multiple VMs hosting custom application software along with Oracle server. I prefer to host the virtual machines under Mac OS, as the "housekeeping" is so much easier - backups, email, encryption, and so on. I recently bought a 12-core processor tray for my Mac Pro just so that I could have a higher memory maximum - my old Mac Pro had 6 cores and maxed out at 48Gb. I bought the 128Gb memory upgrade and it's quite a luxury to have so much memory available to run multiple virtual machines. The 8 memory boards arrived, and I installed them onto the processor tray. No issues - they just worked.

I would recommend this item to a friend! This review is from 128.0GB (8x 16GB) PC10600 DDR3 ECC-Registered 1333MHz SDRAM for Mac Pro 'Nehalem' & 'Westmere' Models.

Verified Buyer
Reviewer: DaveJ Location: Houston Age: Over 65 Experience Level: Power User Owned Product: less than a month
Rating: 5/5 Make a monster out of your older Mac Pro March 31, 2017 Upgraded 2012 Mac Pro 12 Core to 128gb core memory for heavy editing with Final Cut Pro. What an improvement in performance. This 5 year old machine still outperforms most new computers on the market today. This upgrade along with a Nvidia Titan X with 12 gb ram video card cuts movie processing time down significantly.

I would recommend this item to a friend! This review is from 128.0GB (8x 16GB) PC10600 DDR3 ECC-Registered 1333MHz SDRAM for Mac Pro 'Nehalem' & 'Westmere' Models.

Verified Buyer
Reviewer: prandall Location: South Weymouth, MA Age: 55-65 Experience Level: Power User Owned Product: less than a month
Rating: 5/5 Super Quality and Easy Installation February 16, 2017 These were of exceptional quality both in looks and function. I put them in, booted and my running out of memory ended in macOS Sierra. I've used the new memory for some time, now, without a hitch. I'll definitely be back for more upgrades.

I would recommend this item to a friend! This review is from 128.0GB (8x 16GB) PC10600 DDR3 ECC-Registered 1333MHz SDRAM for Mac Pro 'Nehalem' & 'Westmere' Models.

Verified Buyer
Reviewer: DBailey Location: Perth, Western Australia Age: 55-65 Experience Level: Home User Owned Product: less than a month
Rating: 5/5 Easy upgrade January 18, 2017 Very easy to install and an instant and noticeable speed increase on my MAC.

I would recommend this item to a friend! This review is from 48.0GB (3x 16GB) PC10600 DDR3 ECC-R 1333MHz SDRAM ECC for Mac Pro 'Nehalem' & 'Westmere' Models.

Verified Buyer
Reviewer: Fishman Location: Florida Age: 55-65 Experience Level: Power User Owned Product: over 6 months
Rating: 5/5 OWC Mac Memory - outstanding! December 20, 2016 I purchased a new dual 6-core Mac Pro computer in mid-2012. from Apple ...the last of its kind. I immediately upgraded the memory to 48 GB. Recently, I upgraded again with OWC and purchased 5 more of these 16-GB memory modules to max-out my Mac Pro to 128 GB of RAM. Wow! It flies through processor/memory-intensive programs like nothing I have ever seen. OWC stands behind their products and I trust them implicitly. This memory is designed and manufactured to the strict Apple/Mac standards and works perfectly.

I would recommend this item to a friend! This review is from 48.0GB (3x 16GB) PC10600 DDR3 ECC-R 1333MHz SDRAM ECC for Mac Pro 'Nehalem' & 'Westmere' Models.

Verified Buyer
Reviewer: Peer
Rating: 5/5 Very easy to install November 8, 2016 Boot slowwr due the quantity of ram

I would recommend this item to a friend! This review is from 128.0GB (8x 16GB) PC10600 DDR3 ECC-Registered 1333MHz SDRAM for Mac Pro 'Nehalem' & 'Westmere' Models.

Verified Buyer
Reviewer: Anonymous Location: Switzerland Age: 35-44 Experience Level: Home User Owned Product: 5-6 months
Rating: 5/5 Happy and great help videos July 18, 2016 Easy buy, fast delivery and easy installation. Even if you are dumb as me, and don't realize that there are 2 CPUs, thus RAM-slots hidden behind it. The great OWC help video showed that clearly... :D

Since then the RAM works, and works, and works... no issues since about half a year. Highly recommended!

I would recommend this item to a friend!

Verified Buyer
Reviewer: guywithzeisslens Location: Singapore Age: 18-24 Experience Level: Power User Owned Product: less than a month
Rating: 5/5 Reliable June 11, 2016 I would recommend this item to a friend! This review is from 48.0GB (3x 16GB) PC10600 DDR3 ECC-R 1333MHz SDRAM ECC for Mac Pro 'Nehalem' & 'Westmere' Models.
Verified Buyer
Reviewer: Anonymous Location: Paris, France Age: 45-54 Experience Level: Home User Owned Product: 1-3 months
Rating: 5/5 Extremely competent customer service and superb product March 29, 2016 Prior to purchasing, I had a live chat with a very competent service person who guided me through the intricacies of RAM selection for my MacPro 2010.

I wanted to max out the RAM and the advice I received helped me a lot to secure the correct memory reference for purchase.

Shipping to Europe was a mere matter of days and the RAM worked out of the box providing the announced performance.

I'm very satisfied with both the product and overall purchasing experience.

Definitely recommended to european customer who want competent input prior to issuing an order.

I would recommend this item to a friend! This review is from 48.0GB (3x 16GB) PC10600 DDR3 ECC-R 1333MHz SDRAM ECC for Mac Pro 'Nehalem' & 'Westmere' Models.

Verified Buyer
Reviewer: Anonymous Age: 45-54 Experience Level: Hobbiest Owned Product: 1-3 months
Rating: 5/5 Excellent Upgrade...will be Getting Another 64G January 1, 2016 Fast shipping and no issues with the item. Very Satisfied!

I would recommend this item to a friend! This review is from 64.0GB (4x 16GB) PC10600 DDR3 ECC-Registered 1333MHz SDRAM for Mac Pro 'Nehalem' & 'Westmere' Models.

Verified Buyer
Reviewer: Anonymous Location: London, England Age: 55-65 Experience Level: IT Professional Owned Product: 1-3 months
Rating: 5/5 Take your Nehalem Mac Pro to the max June 29, 2015 Added this to an earlier OWC 64GB memory kit for my 2010 Mac Pro. Different part numbers but fully compatible. Perfect for a 12-core VM farm

I would recommend this item to a friend! This review is from 64.0GB (4x 16GB) PC10600 DDR3 ECC-Registered 1333MHz SDRAM for Mac Pro 'Nehalem' & 'Westmere' Models.

Verified Buyer
Reviewer: Anonymous Location: Palo Alto Age: 45-54 Experience Level: Power User Owned Product: 1-3 months
Rating: 5/5 Updated a Mac Pro 5.1 mid 2010 June 4, 2015 The Ram was well packed, easy to install and worked perfectly since the first day

I would recommend this item to a friend! This review is from 48.0GB (3x 16GB) PC10600 DDR3 ECC-R 1333MHz SDRAM ECC for Mac Pro 'Nehalem' & 'Westmere' Models.

Verified Buyer
Reviewer: Anonymous Location: Freestone, CA Age: Over 65 Experience Level: Power User Owned Product: 3-4 months
Rating: 5/5 Out with the old, in with the new. March 1, 2015 I'm a long term OWC customer. My 2010 6-core's 3x 8GB OWC chips needed a memory refresh for Yosemite and the Adobe CC suite. With the purchase of 3 x 16GB chips I received a 3 x $40 credit for my old chips. The great thing about purchasing memory from OWC is support. If there is a problem they will take care of it. No worries.

I would recommend this item to a friend! This review is from 48.0GB (3x 16GB) PC10600 DDR3 ECC-R 1333MHz SDRAM ECC for Mac Pro 'Nehalem' & 'Westmere' Models.

Verified Buyer
Reviewer: spoonie
Rating: 5/5 Plug it in, it works! December 11, 2012 16gb x 2 - leaving lots of room for more ram down the line. No issues running gigs and gigs of Kontakt samples.

I would recommend this item to a friend! This review is from 32.0GB (2x 16GB) PC10600 DDR3 ECC-Registered 1333MHz SDRAM ECC-Registered for Mac Pro 'Nehalem' & 'Westmere' Models.

Verified Buyer
Reviewer: DatacomTSS Location: Australia Owned Product: 1-3 months
Rating: 5/5 2 x 64GB in a MacPro Server with ESXi September 20, 2012 We placed two of these kits in our 2012 (mid-year update) MacPro Server 12 core machine and it runs flawlessly with ESXi 5.1 accessing all 128GB of RAM.

Great aftermarket upgrade in terms of value for money and fast shipping to Australia.

I would recommend this item to a friend! This review is from 64.0GB (4x 16GB) PC10600 DDR3 ECC-Registered 1333MHz SDRAM for Mac Pro 'Nehalem' & 'Westmere' Models.

OWC Memory 16.0GB 4 x 4.0GB PC10600 DDR3 ECC-Registered 1333Mhz / 1066MHz 240 Pin Mfr P/N: 13MP3S4M16GK OWC SKU: OWC13MP3S4M16GK OWC Memory Upgrade Kit Lifetime OWC Limited Warranty Ships: Same Day
Reviews (7)
Only $103.96OWC Price $87.99
Add to CartOther World Computing 13MP3S4M16GK In Stock, Click to Buy Now
Additional Capacities & Kits:
  • 16GB
    • Ships: Same Day
    • $59.99
  • 16GB
  • 32GB
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    • Matched Kit for $119.99
  • 48GB
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    • Matched Kit for $174.99
  • 64GB
    • Ships: Same Day
    • Cyber Saver $229.00
  • 96GB
    • Ships: Same Day
    • Only $359.94
    • Matched Kit for $329.00
  • 128GB
    • Ships: Same Day
    • Only $479.92
    • Matched Kit for $419.00
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