1-800-275-4576
64GB OWC Memory Upgrade Kit
4 x 16GB PC21300 DDR4 2666MHz SO-DIMMs for 27-inch iMac with Retina 5K (2019 - 2020) and compatible PCs
Mfr P/N: 2666DDR4S64S OWC SKU: OWC2666DDR4S64S
$90.99 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: Parallels Desktop Pro Edition for Mac - 1 Year License. SPECIAL PURCHASE
Memory Built by Mac People, for Mac People (and PC too), for Over 30 Years
- Memory is the most cost-effective DIY upgrade you can make to your Mac or PC.
- Unleash the true speed and performance of your system and applications.
- Experience increased efficiency and productivity. Open more apps and files, all at the same time.
- Warranty Safe Upgrade
- Free step-by-step installation videos
- Why do I need more Memory?
- 30 Day Money Back Guarantee
- OWC Memory Lifetime Limited Warranty including Advanced Replacement Program
Overview
OWC Memory. Built for Macs + PCs.
Experience your computer's true performance potential.
Improve System Speed
OWC Memory is the most cost effective and simple DIY upgrade you can install to unleash your Mac or PC's full potential, and speed up overall responsiveness.
More Apps. More Files
Become a multi-tasking maven when you upgrade your Mac or PC with OWC Memory. Open more apps. Open larger files. Plus, work with multiple files all at the same time.
Save $$ vs Factory
Save BIG vs factory memory options. Plus, select among options not offered by the factory. OWC makes it easy to find the perfect upgrade to fit your needs.
Lab Tested Compatibility
We test every OWC memory module at our in-house lab so you can upgrade with the confidence that your memory is built-to-last.
Lifetime Warranty
We built your OWC Memory upgrade to meet or exceed the toughest industry specs to provide years of worry-free service.
Step-by-Step Videos
Our detailed install videos guide your upgrade from start to finish. We provide all the steps to make your OWC Memory upgrade DIY easy.
Experience the OWC Difference
Rely on the trusted name for memory upgrades, drives and accessories for over 30 years. Your OWC Memory upgrade was built by Mac and PC people, for Mac and PC people. Our expert support team is always a call or click away. You can talk to an actual human who will kindly provide advice and guidance for any questions you may have.
Being helpful and treating others the way you would want to be treated is not just a novel idea. It’s how we do business. It's how we’re built. It's what we’ve been doing since 1988.
Includes
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- (4) 16GB PC21300 2666MHz DDR4 SO-DIMM memory modules
- OWC Memory Lifetime Limited Warranty including Advanced Replacement Program
Specs
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Data Rate
- 2666MT/s
I/O Clock Speed
- 1333MHz
Registration
- Non-registered
Error Correction
- Non-ECC
Cycle Time
- 0.75 ns
Form Factor
- SO-DIMM
Type of Memory
- DDR4
PC Speed
- 21300
Timing
- CAS = 18.0
- Full Parameters: 18-18-18-14
Bandwidth
- 21.3GB/s
JEDEC
- Fully compliant with JEDEC specifications
Total Capacity
- 64GB
Pin Count
- 260-pin
Printed Circuit Board Type
- Low noise 8-layer PCB
RoHS Compliant
- Yes
Ambient Temperature
- Operating: 32°F to 185°F (0°C to 85°C)
Compatibility & Installation Videos
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- For 27-inch iMac (2020) models – iMac20,1 and iMac 20,2 – OWC recommends that all DIMMs be the same capacity, speed, and manufacturer to ensure optimal memory performance.
- 21.5-inch iMac (Mid 2017) – iMac18,1 – is compatible with 2666MHz memory, but will operate at 2133MHz speed.
PC Compatible
Videos
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Customer Reviews
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Installed the 64GB of memory and now the 27" iMac periodically has a hardware crash forcing me the use to cycle the power. Tried to live with this but after four hardware crashes removed the 64GB of memory purchased and reinstalled the 8GB that came with the 27" iMac.
Verified Purchase.- Reviewer:Reviewer3199988753
We’re truly sorry to hear about the trouble you’ve experienced after installing the memory. That kind of disruption can be incredibly frustrating, especially when you’re expecting an upgrade to improve performance. This definitely isn’t the experience we want for you. A member of our team will be reaching out shortly to assist with troubleshooting and to set up an RMA if necessary. We're here to help get your system running smoothly again as quickly as possible. Thank you for bringing this to our attention.
Everything about this experience was easy: finding the specific cards I needed for my 2020 iMac, ordering them, receiving them (they arrived even earlier than the original ETA), and installing them using the helpful and easy video provided. The only thing I would say to add to the video is to encourage waiting an extra minute or two once the new cards are installed after booting up your Mac for the first time - there was a delay for me and at first I thought I had installed the cards wrong. But it turned out all I had to do was wait an extra minute on the first boot-up afterward. Really great experience! Highly recommended.
I would recommend this product to a friend!
Verified Purchase.- Reviewer:trjonas1
Thank you so much for your amazing 5-star review! We're thrilled to hear that your experience was seamless from start to finish. It's fantastic that you found the cards you needed for your iMac quickly and that they arrived ahead of schedule! We appreciate your feedback about the installation video, and we'll definitely consider your suggestion regarding the boot-up delay. Your insights help us improve and ensure others have a great experience too. Thanks for being a valued customer!
I purchased 128 GB from Macsales.com a few years ago and it crashed my Mac a lot. When I two sticks out, it worked. I looked for reviews and this was a common issue from this vendor due to low quality ram and people suggested going to Crucial for memory. I recently had a real need to upgrade from 64 to 128 GB and couldn't find the ram from Crucial and decided to give macsales.com another chance. Memory arrived, I installed it and had no crashes in 2 weeks. I made sure I was using close to all that memory by starting up many virtual machines. It worked great.
I would recommend this product to a friend!
Verified Purchase.- Reviewer:Reviewer200356250
We’re absolutely thrilled to hear about your positive experience with our 128 GB memory! Thank you for giving us another chance and for sharing your journey. It's fantastic to know that the memory has been working smoothly for you with no crashes. We pride ourselves on providing high-quality products, and your feedback reassures us that we're on the right track. Enjoy your upgraded performance, and we look forward to helping you with any future upgrades!
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