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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-Registered 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.
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 4-Core (Mid 2012)
(June, 2012)
Model ID: MacPro5,1
3.2GHz
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 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 9 out of 9 (100%) reviewers would recommend this product
Verified Buyer
Reviewer: AverageToad-16978
Rating: 5/5 16.0GB Mac Pro Memory arrived fast May 18, 2021 Great service. The package arrived fast and in perfect condition .

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-R SDRAM Modules.

Verified Buyer
Reviewer: ProfJG Location: DC Area Age: 55-65 Experience Level: Home User Owned Product: 1-3 months
Rating: 5/5 Up and running in 5.4.3.2.1. October 14, 2018 Works flawlessly. Upgraded early 2009 to 16gb ram.

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-R SDRAM Modules.

Reviewer: bellard Location: Berkeley, California Age: 55-65 Experience Level: Power User Owned Product: over 6 months
Rating: 5/5 Truly plug and play... March 9, 2018 This memory is such a work horse that when I needed to add more... well here I am again getting this same memory kit to double the memory of my machine.

I would recommend this item to a friend! This review is from 16.0GB Mac Pro Early 2009 Memory Matched Set (4x 4GB) PC-8500 1066MHz DDR3 ECC-Registered SDRAM Modules.

Verified Buyer
Reviewer: Coolsed Location: Gaborone, Botswana Age: 25-34 Experience Level: IT Professional Owned Product: less than a month
Rating: 5/5 Perfect Deal February 9, 2018 The memory arrived in good condition and the delivery was quite quick! I am so happy with OWC. Will always buy from them online. I am a happy customer.

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-R SDRAM Modules.

Verified Buyer
Reviewer: Ratos Location: Rotterdam, The Netherlands Age: 45-54 Experience Level: Power User Owned Product: 1-3 months
Rating: 5/5 These memory modules work great, just as expected! December 7, 2017 I bought these memory modules at OWC after I had a very good experience with buying at this website some time ago. The modules are working great and were very nicely packed for shipment to The Netherlands. The order took only a few weeks from door to door, so even the shipment was organised very well. The only minor thing why I can not give 5 stars is that the track and trace is only working to follow the shipment in the US after that it is waiting and hoping because there is no tracking info available. Beyond this minor thing the product is excellent!

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-R SDRAM Modules.

Verified Buyer
Reviewer: Pako Age: 55-65 Experience Level: Power User Owned Product: 1-3 months
Rating: 5/5 very good product March 8, 2017 great speed

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-R SDRAM Modules.

Verified Buyer
Reviewer: FAAR Location: Austin, TX Age: 35-44 Experience Level: Power User Owned Product: 1-3 months
Rating: 5/5 works perfectly in my 2010 Mac Pro February 17, 2017 i bought 2 of these 16GB sticks of RAM (for a total of 4) and now my 2010 Mac Pro has 32GB of RAM. also going to look into trading in my old RAM with OWC to earn a few bucks.

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-R SDRAM Modules.

Verified Buyer
Reviewer: Anonymous Location: Australia Age: 55-65 Experience Level: Power User Owned Product: over 6 months
Rating: 5/5 ????? - excellent! November 20, 2015 When it comes to memory, what can one say? It either works or it doesn't. OWC memory works. When I maxed out the memory then I never have an issue with performance. My Mac really hums along nicely.

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-R SDRAM Modules.

Verified Buyer
Reviewer: Framer Location: Murray Bridge South Australia Age: 55-65 Experience Level: Power User Owned Product: less than a month
Rating: 5/5 Excellent product and service October 14, 2011 Ordered 8gb x 4 memory dimms for my mac pro late tuesday (Australian time) and received them Friday morning. Fantastic service! They work perfectly. I would highly recommend the OWC Ram and the OWC website. Very Happy!!!

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-R SDRAM Modules.

OWC Memory 12.0GB 3 x 4.0GB PC8500 DDR3 ECC-Registered 1066MHz 240 Pin Mfr P/N: 85MP3S4M12GK OWC SKU: OWC85MP3S4M12GK OWC Memory Upgrade Kit Lifetime OWC Limited Warranty Ships: Same Day
Reviews (9)
Only $77.97Matched Kit for $62.99
Add to CartOther World Computing 85MP3S4M12GK In Stock, Click to Buy Now
Additional Capacities & Kits: 2 x Module Kits 3 x Module Kits
  • 12GB (3x4)
  • 24GB (3x8)
    • Ships: Same Day
    • Matched Kit for $94.99
4 x Module Kits
  • 16GB (4x4)
    • Ships: Same Day
    • Only $103.96
    • Matched Kit for $82.99
  • 32GB (4x8)
    • Ships: Same Day
    • Matched Kit for $119.99
6 x Module Kits
  • 24GB (6x4)
    • Ships: Same Day
    • Only $155.94
    • Matched Kit for $122.99
  • 48GB (6x8)
    • Ships: Same Day
    • Matched Kit for $169.99
8 x Module Kits
  • 32GB (8x4)
    • Ships: 24-48 hrs
    • Only $207.92
    • Matched Kit for $162.99
  • 64GB (8x8)
    • Ships: Same Day
    • Matched Kit for $219.99
12 x Module Kits
  • 48GB (12x4)
    • Ships: 24-48 hrs
    • Only $311.88
    • Matched Kit for $199.99
  • 96GB (12x8)
    • Ships: Same Day
    • Matched Kit for $269.99
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