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Product Specs:
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.
This OWC Memory is compatible with... Learn how to find your Mac's model ID or PC specs
iMac Intel
iMac w/Retina 5K display
(27-inch Late 2015)
(October 2015)
Model ID:iMac17,1
3.2GHz i5, 3.3GHz i5, 4.0GHz i7
Detailed specs coming soon

Customer Ratings

Write a Review 4.8 / 5 8 out of 8 (100%) reviewers would recommend this product
Verified Buyer
Reviewer: ServerHacker888 Location: Seattle Experience Level: IT Professional Owned Product: less than a month
Rating: 4/5 Got a couple bad DRAM sticks. No problem! August 8, 2016 I ordered a 64GB DRAM set for my iMac, for the same price Apple wanted to charge for 32GB. I DID get a bad batch, which showed multiple RAM errors under extreme load. HOWEVER, customer support was quick and excellent. They paid my return postage and sent me a new batch. Extensive testing over 40 hours shows the entire 64GB is perfect.

Well done!

I would definitely order this again from OWC.

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

Verified Buyer
Reviewer: Anonymous
Rating: 5/5 It just worked for the model of iMac17,1 April 24, 2016 Worked nicely.

I would recommend this item to a friend!

Verified Buyer
Reviewer: Anonymous Location: Windsor, UK Age: 45-54 Experience Level: Power User Owned Product: 1-3 months
Rating: 5/5 Great Price, Works well in my iMac 27 5K April 5, 2016 Bought 64GB RAM to upgrade my new iMac 27 5K Retina. Arrived early, was easy to fit, and works great. Very happy with the purchase.

I would recommend this item to a friend!

Verified Buyer
Reviewer: Anonymous Location: Toronto, Ontario Age: 35-44 Experience Level: Home User Owned Product: less than a month
Rating: 5/5 Great Service and Product March 3, 2016 Ordered the 64gb upgrade kit for my new imac on Saturday, it came on Thursday, Installed the memory in less than 20 seconds thanks to the wonderful instructional video provided by OWC, my system was good to go.

Pre Delivery they were very quick at replying to any concerns I had, I would order from OWC again, and would recommend to any mac user who wants to buy memory or any related products.

I would recommend this item to a friend!

Verified Buyer
Reviewer: Anonymous Location: San Jose, CA Age: 45-54 Experience Level: Home User Owned Product: less than a month
Rating: 5/5 Works as advertised March 1, 2016 Apple website claims the iMac can be outfitted with maximum 32 GB of RAM. OWC says the iMac maximum RAM is 64 GB. I installed 64 GB of OWC RAM into a new iMac and it indeed works. Fast.

I would recommend this item to a friend!

Verified Buyer Top 250 Contributor
Reviewer: Anonymous Location: Alaska Age: 45-54 Experience Level: Power User Owned Product: 1-3 months
Rating: 5/5 64GB RAM for 5K iMac February 21, 2016 Having the ability to access 64 GB of RAM for my 5K iMac is wonderful, especially as a professional landscape photographer. Overall performance of this memory has been superb. I've always used OWC memory for all of my Mac products. I highly recommend!

I would recommend this item to a friend!

Verified Buyer Top 250 Contributor
Reviewer: Anonymous Location: Florida Age: Over 65 Experience Level: IT Professional Owned Product: 1-3 months
Rating: 5/5 5K iMac To The Max January 13, 2016 64GB of memory makes my new 4GHz i7 iMac an even faster rocket ship. This is definitely the the best bang for your buck.

I would recommend this item to a friend!

Verified Buyer
Reviewer: Anonymous Location: Phoenix, Arizona Age: 55-65 Experience Level: Power User Owned Product: 1-3 months
Rating: 5/5 I saved a ton of money! January 13, 2016 I love working with OWC and their staff. They have been taking great care of me and every Mac I've ever owned. I recently bought the 2015 27-inch iMac and came directly to OWC to put the finishing touches on my Mac.

The 64GB-RAM upgrade was a solid investment and the money I save shopping at OWC keeps me coming back.

I would recommend this item to a friend!

OWC Memory 64.0GB 4 x 16.0GB PC3-14900 DDR3 Kit Mfr P/N: 1867DDR3S64S OWC SKU: OWC1867DDR3S64S OWC Memory Upgrade Kit Lifetime OWC Limited Warranty Ships: Same Day Only $719.96Matched Kit for $697.99
Add to CartOther World Computing 1867DDR3S64S In Stock, Click to Buy Now