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4.0GB OWC Memory Upgrade

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 5 / 5 6 out of 6 (100%) reviewers would recommend this product
Verified Buyer
Reviewer: jordan2087 Location: Ontario, Canada Age: 25-34 Experience Level: Power User Owned Product: 1-3 months
Rating: 5/5 received and enjoying August 15, 2016 I got this relatively quickly. I've had no problems with the problem at all and there was ZERO problems. I'm very happy with service of MacSales. If you're unsure about buying parts, for anything mac related, pick MacSales before E-b-a-y or A-m-a-z-o-n. I'm sure the ram was just renamed by MacSales, however the ram was high quality and well-made.

I would recommend this item to a friend! Customer Videos:

Verified Buyer
Reviewer: Anonymous Location: Canada Age: 35-44 Experience Level: IT Professional Owned Product: 1-3 months
Rating: 5/5 EXCELLENT. April 19, 2016 as described in ad description. easy installation. no glitches.

I would recommend this item to a friend!

Verified Buyer
Reviewer: Anonymous Location: Nixa MO
Rating: 5/5 DIMM is Fine, Rebate Not So Much March 8, 2016 Ordered a 4GB DIMM to replace a 2GB that came with my MacPro from MacSales. Looked into the Rebate program: my 2 GB was not wanted, so I couldn't send it back. Surprisingly, the rebate on a 4GB is only $4. It would cost that much to send it back to OWC.

I would recommend this item to a friend!

Verified Buyer Top 250 Contributor
Reviewer: Anonymous Location: New York, NY Age: Over 65 Experience Level: Home User Owned Product: 1-3 months
Rating: 5/5 Works fine, once I got it installed August 25, 2015 It took me about 20 minutes to get the 4GB RAM installed and working, despite my having watched the video. That's because the new RAM and/or some of the 3 existing 1GB sticks were not visible to the Mac Pro, with red lights showing to the side of the sticks. Eventually, by blowing out the slots again and switching sticks around in the slots, I got all the RAM working. I should point out that the Mac Pro was in use by its previous owner for 5 years, and had never been blown out.

I would recommend this item to a friend!

Verified Buyer
Reviewer: Anonymous
Rating: 5/5 Looks different but it works. June 7, 2015 Had to replace a bad SDRAM memory on my MacPro. The memory sent to me is encased in metal. Looks different from the nude memory it is replacing. But it works and seems to work well. I have no idea what the metal case is for.

I would recommend this item to a friend!

Verified Buyer Top 100 Contributor
Reviewer: oguza Location: Israel Owned Product: over 6 months
Rating: 5/5 flawless, cheap and fast December 9, 2012 Since RAM is very expensive in the Apple stores, I started using OWC's RAM. It's half the price and working just as well as apple RAM. Recommended to all :-)

I would recommend this item to a friend!

OWC Memory 4.0GB 4.0GB PC8500 DDR3 Module Mfr P/N: 8566D3ECC4GB MacSales.com SKU: OWC8566D3ECC4GB OWC Memory Upgrade Kit Lifetime OWC Limited Warranty Ships: Same Day only $23.88
Add to CartOther World Computing 8566D3ECC4GB In Stock, Click to Buy Now