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OWC 64GB (4 x 16GB) PC21300 DDR4 2666MHz 260pin SO-DIMMs Memory Ram Module Compatible with Mac Mini 2018, iMac 2019 and up, and Compatible PCs (OWC2666DDR4S64S)

4.6 4.6 out of 5 stars 3,809 ratings

$154.99
FREE Returns
64 GB
( 4 x 16GB )
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Purchase options and add-ons

Brand OWC
Computer Memory Size 64 GB
RAM Memory Technology DDR4
Memory Speed 1333 MHz
Compatible Devices Desktop

About this item

  • OWC 256.0GB UPGRADE: Consists of Four 16GB DDR4 PC4-21300 SODIMM 260-Pin, 1.2 Volts, Non-registered, Non-ECC, Fully compliant with JEDEC specifications, ROHS compliant, warranty safe upgrade; Backed by OWC Memory Lifetime Limited Warranty including the OWC Lifetime Advanced Replacement Program
  • COMPATIBLE WITH: 2020 iMac: iMac w/Retina 5K display (27 inch mid 2020) Model ID: iMac20,1 and iMac20,2 (3.1GHz i5, 3.3GHz i5, 3.8GHz i7, 3.6GHz i9)
  • COMPATIBLE WITH: 2019 iMac: iMac w/Retina 5K display (27-inch Early 2019) Model ID: iMac19,1 (3.0GHz i5, 3.1GHz i5, 3.7GHz i5, 3.6GHz i9) Models: MRQY2LL/A, MRR02LL/A, MRR12LL/A
  • COMPATIBLE WITH: PC gaming laptops and PC desktops: Dell, HP , Toshiba, ASUS, Acer, Supermicro, Fujitsu, Gigabyte, Intel, Lenovo, LG, Samsung, Sony, Supermicro
  • COMPATIBLE PART NUMBERS: CT16G4S266M, CT2K16G4S266M, KCP426SD8/16, KCP426SS8/16, M471A2K43BB1‐CTD, M471A2K43CB1‐CTD, M471A2K43DB1‐CTD, M474A2K43DB1‐CTD, CT16G4SFS8266, HMA82GS6CJR8N‐VK
  • INDUSTRY LEADING: Consumer Friendly Advanced Replacement Program and Limited Lifetime Warranty, which Includes Free Tech Support by Other World Computing
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OWC 64GB (4 x 16GB) PC21300 DDR4 2666MHz 260pin SO-DIMMs Memory Ram Module Compatible with Mac Mini 2018, iMac 2019 and up, and Compatible PCs (OWC2666DDR4S64S)
OWC 64GB (4 x 16GB) PC21300 DDR4 2666MHz 260pin SO-DIMMs Memory Ram Module Compatible with Mac Mini 2018, iMac 2019 and up, and Compatible PCs (OWC2666DDR4S64S)
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OWC 16GB (2 x 8GB) PC21300 DDR4 2666MHz 260pin SO-DIMMs Memory Ram Module Compatible with Mac Mini 2018, iMac 2019 and up, and Compatible PCs (OWC2666DDR4S16P)
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OWC 8GB PC21300 DDR4 2666MHz 260pin SO-DIMM Memory Ram Module Compatible with Mac Mini 2018, iMac 2019 and up, and Compatible PCs (OWC2666DDR4S08G)
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OWC 16GB PC21300 DDR4 2666MHz 260pin SO-DIMM Memory Ram Module Compatible with Mac Mini 2018, iMac 2019 and up, and Compatible PCs (OWC2666DDR4S16G)
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OWC 32GB (2 x 16GB) PC21300 DDR4 2666MHz 260pin SO-DIMMs Memory Ram Module, Compatible with Mac Mini 2018, iMac 2019 and up, and Compatible PCs, (OWC2666DDR4S32P)
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Price$154.99$129.99$39.99$19.99$39.99$78.99
Delivery
Get it as soon as Friday, May 17
Get it as soon as Friday, May 17
Get it as soon as Friday, May 17
Get it as soon as Friday, May 17
Get it as soon as Friday, May 17
Get it as soon as Friday, May 17
Customer Ratings
Easy to install
4.8
4.9
4.8
4.8
4.8
4.8
For gaming
4.6
4.3
4.6
4.6
4.6
4.6
Value for money
4.6
4.7
4.6
4.6
4.6
4.6
Tech Support
4.3
4.7
4.3
4.3
4.3
4.3
Stability
4.8
4.8
4.8
4.8
4.8
Sold By
OWC (Other World Computing)
v-color Technology Inc.
OWC (Other World Computing)
OWC (Other World Computing)
OWC (Other World Computing)
OWC (Other World Computing)
computer memory size
64 GB
64 GB
16 GB
8 GB
16 GB
32 GB
memory speed
1333 MHz
2666 MHz
1333 MHz
1333 MHz
1333 MHz
1333 MHz
RAM tech
DDR4
DDR4 NON ECC SO-DIMM
DDR4
DDR4
DDR4
DDR4
number of items
4
2
2
1
1
2
data transfer rate
2666 MHz
21300 megabytes per second
2666 MHz
2666 MHz
2666 MHz
2666 MHz
number of pins
260
260
260
260
260
260

From the brand


Product Description

COMPATIBLE WITH THE FOLLOWING MODELS

204PIN SO-DIMM ddr4 ram 2666mhz  memory upgrade for IMAC   MAC MINI pc4-21300 pc21300 2019 MID LATE

2019 iMAC 5K 19,1

  • iMac Core i5 3.0 and 3.1 27" (5K, 2019)
  • iMac Core i5 3.7 27" (5K, 2019)
  • iMac Core i9 3.6 27" (5K, 2019)

204PIN SO-DIMM ddr4 ram 2666mhz  memory upgrade for IMAC   MAC MINI pc4-21300 pc21300 2019 MID LATE

2020 iMAC 5K 19,1

  • iMac Core i5 3.1 and 3.3 27" (5K, 2020)
  • iMac Core i7 3.8 27" (5K, 2020)
  • iMac Core i9 3.6 27" (5K, 2020)

OWC DDR4 PC4-21300 2666MHZ MEMORY FOR THE 2019-2020 5K iMAC

Technology DDR4
Speed PC4-21300 2666MHz
Form Factor 260PIN SO-DIMM
ECC Type NON ECC
Voltage 1.2v
CL Rating 19
Avail Size 4GB, 8GB, 16GB, 32GB, 64GB, 128GB
Compatible With iMac 2019-2020 5K
Backward Compatible WILL WORK WITH PC4-19200 2400MHz
204PIN SO-DIMM ddr4 ram 2666mhz  memory upgrade for IMAC   MAC MINI pc4-21300 pc21300 2018 2019 2020
204PIN SO-DIMM ddr4 ram 2666mhz  memory upgrade for IMAC   MAC MINI pc4-21300 pc21300 2018 2019 2020
204PIN SO-DIMM ddr4 ram 2666mhz  memory upgrade for IMAC   MAC MINI pc4-21300 pc21300 2018 2019 2020

Other iMac DDR4 Upgrades Available from OWC

204PIN SO-DIMM ddr4 ram 2666mhz  memory upgrade for IMAC   MAC MINI pc4-21300 pc21300 2018 2019 2020

128GB (4X32GB) UPGRADE

204PIN SO-DIMM ddr4 ram 2666mhz  memory upgrade for IMAC   MAC MINI pc4-21300 pc21300 2018 2019 2020

64GB (2X32GB) UPGRADE

204PIN SO-DIMM ddr4 ram 2666mhz  memory upgrade for IMAC   MAC MINI pc4-21300 pc21300 2018 2019 2020

64GB (4X16GB) UPGRADE

204PIN SO-DIMM ddr4 ram 2666mhz  memory upgrade for IMAC   MAC MINI pc4-21300 pc21300 2018 2019 2020

32GB (2X16GB) UPGRADE

204PIN SO-DIMM ddr4 ram 2666mhz  memory upgrade for IMAC   MAC MINI pc4-21300 pc21300 2018 2019 2020

16GB (2X8GB) UPGRADE

Customer Reviews
4.6 out of 5 stars
3,809
4.6 out of 5 stars
3,809
4.6 out of 5 stars
3,809
4.6 out of 5 stars
3,809
4.6 out of 5 stars
3,809
Price
$299.99 $154.99 $154.99 $78.99 $39.99
Capacity
128GB (4X32GB) 64GB (2X32GB) 64GB (4X16GB) 32GB (2X16GB) 16GB (2X8GB)
Speed
PC4-21300 2666MHz PC4-21300 2666MHz PC4-21300 2666MHz PC4-21300 2666MHz PC4-21300 2666MHz
Cas Latency
19 19 19 19 19
Voltage
1.2 1.2 1.2 1.2 1.2V
Form Factor
260PIN 260PIN 260PIN 260PIN 260PIN
Format
SO DIMM SO DIMM SO DIMM SO DIMM SO DIMM

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Additional Information

Warranty & Support

Amazon.com Return Policy:You may return any new computer purchased from Amazon.com that is "dead on arrival," arrives in damaged condition, or is still in unopened boxes, for a full refund within 30 days of purchase. Amazon.com reserves the right to test "dead on arrival" returns and impose a customer fee equal to 15 percent of the product sales price if the customer misrepresents the condition of the product. Any returned computer that is damaged through customer misuse, is missing parts, or is in unsellable condition due to customer tampering will result in the customer being charged a higher restocking fee based on the condition of the product. Amazon.com will not accept returns of any desktop or notebook computer more than 30 days after you receive the shipment. New, used, and refurbished products purchased from Marketplace vendors are subject to the returns policy of the individual vendor.
Product Warranty: For warranty information about this product, please click here

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OWC 64GB (4 x 16GB) PC21300 DDR4 2666MHz 260pin SO-DIMMs Memory Ram Module Compatible with Mac Mini 2018, iMac 2019 and up, and Compatible PCs (OWC2666DDR4S64S)

OWC 64GB (4 x 16GB) PC21300 DDR4 2666MHz 260pin SO-DIMMs Memory Ram Module Compatible with Mac Mini 2018, iMac 2019 and up, and Compatible PCs (OWC2666DDR4S64S)


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Customer reviews

4.6 out of 5 stars
4.6 out of 5
3,809 global ratings

Customers say

Customers like the performance, ease of installation, quality and value of the internal memory. They mention that it performs flawlessly, it's easy to install and that it'll be worth the investment. Opinions are mixed on booting.

AI-generated from the text of customer reviews

420 customers mention341 positive79 negative

Customers like the performance of the internal memory. They say it performs flawlessly, has no issues in operation, and is durable and effective. Some mention that the system rebooted and worked perfectly.

"Easy to install and performs flawlessly" Read more

"...After the first reboot, the system is working perfectly." Read more

"It worked perfectly and really happy with the compatibility of it too, tried another brand it didn’t work at all!! But this brand works very well!!..." Read more

"Item works fine after a kind of confusing shipping mishap. And getting the wrong product...." Read more

280 customers mention269 positive11 negative

Customers find the installation process of the internal memory to be super easy. They say it's simple than it looks and that it'll be the best upgrade they've done.

"All good with this product so far. Small and compact. Support for installing it was helpful, but in the end I brought it to an Apple certified..." Read more

"Easy to install and performs flawlessly" Read more

"Very easy to install. Took less than 5 minutes!" Read more

"...The upgrade was straightforward: unplug, place the screen face-down, open the memory door, remove original SO-DIMMs and replace with the new..." Read more

156 customers mention140 positive16 negative

Customers like the quality of the memory. They say it works 100% with no issues, is durable, and dependable. Some say that it's a perfect memory upgrade for 2020 iMac 3.6 i9.

"Perfect memory upgrade for 2020 iMac 3.6 i9...." Read more

"Fast delivery, swapped in minutes and up and running. Who know upgrading was so quick and easy?" Read more

"Easy upgrade of memory." Read more

"...Great product/quality and I highly recommend if you order just a 2X kit, to remove the existing 8GB modules out...." Read more

137 customers mention128 positive9 negative

Customers appreciate the value of the memory sticks. They say it's worth the investment, affordable, and reliable. Some customers also mention that it'll save them a ton of money vs buying ram from Apple.

"Super happy with this and very affordable upgrade to my i-Mac.....Better than buying a new one for $1,500!" Read more

"Seem to be working well and great upgrade for the money" Read more

"...The OWC cards are cost effective, easy to install (press them down into the open slots) and work like a charm." Read more

"Great quality and worked flawlessly right away. Good value for the money and very simple to install...." Read more

33 customers mention29 positive4 negative

Customers like the compatibility of the RAM modules. They say it fits perfectly, works first time, and is compatible with their new Mac. The computer recognizes the RAM without issues and works as advertised.

"All good with this product so far. Small and compact...." Read more

"It worked perfectly and really happy with the compatibility of it too, tried another brand it didn’t work at all!! But this brand works very well!!..." Read more

"...My system recognized the ram without issue and they are all running at 2667mhz speed. Zero issues." Read more

"...These RAM modules fit perfectly and worked first time. I'm so glad I looked into adding more RAM...." Read more

56 customers mention22 positive34 negative

Customers are mixed about the booting of the memory. Some mention that it boots up with no issues, while others say that it wouldn't boot.

"...RAM into slot 1 and 2, instead of 1 and 3, this actually stopped it from booting up, I got a blank screen and started panicking!..." Read more

"Fast delivery, swapped in minutes and up and running. Who know upgrading was so quick and easy?" Read more

"...excitement quickly turned to disappointment when the iMac failed to boot with the new RAM...." Read more

"...30 seconds or so to orient to and recognize the new memory, then booted up fine... no problems or issues and I now have 80gb of fully recognized and..." Read more

Fast delivery, works as expected - UPDATED
5 Stars
Fast delivery, works as expected - UPDATED
May 2021: Upgraded an iMac 2020 running Catalina from 8 Gb to 64 Gb. International delivery, expected this within three weeks but was quickly delivered in two. The upgrade was straightforward: unplug, place the screen face-down, open the memory door, remove original SO-DIMMs and replace with the new (slots 2 and 4). Works like a charm at 2667 MHz; not tech support needed. Following other user comments, I did not even try to use both the original and new SIMMs at the same time; may buy another 64 to max this out. End result: 64 Gb, no longer swapping although I am lately cutting it close. Very happy with the upgrade kit!UPDATED to Novembre 2021: Decided to max it out so I ordered another round of 64. Quick international delivery, slightly different packaging, installed in slots 1 and 3 (2 and 4 already filled with 32s). Slow initial boot, all 128 Gb recognized, but speed went down to 2133 MHz? Confirmed with Novabench and Geekbench. Unexpected. Visual inspection, it turns out all 4 chips are OWC, but each pair is visibly different and comes from a different manufacturer. I contacted support and after a quick exchange of emails, I tried swapping memory around. Success! The earlier batch went into slots 1 and 2, the new batch into slots 3 and 4 - 2666 Mhz reported, and the benchmarks recover that % lost to the earlier configuration.If I had to do this again, I would order all four chips in one go and save myself the hassle and the scare. Support responded brilliantly, thanks!
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Top reviews from the United States

Reviewed in the United States on January 25, 2024
Size: 64 GBColor: ( 4 x 16GB )Verified Purchase
All good with this product so far. Small and compact. Support for installing it was helpful, but in the end I brought it to an Apple certified repair shop to get it installed. Once they did it, it worked. It could’ve used some better instructions. Seems that going from a small amount of RAM to quite a bit more requires a bit of a wait time when first restarting.
I thought it was defective but the repair shop said that’s all it was. They’ve seen this happen many times over the years. Went from 8g to 64g. If it doesn’t turn on, they said just let it sit there for 10-15 minutes and then it turns on. Very weird as I’ve changed RAM in the past with no problems. In the end though, I’m happy with it. Once it started all was good.
One person found this helpful
Report
Reviewed in the United States on February 27, 2024
Size: 32gbColor: (2 x 16GB )Verified Purchase
Easy to install and performs flawlessly
Reviewed in the United States on April 22, 2024
Size: 32gbColor: (2 x 16GB )Verified Purchase
It worked perfectly and really happy with the compatibility of it too, tried another brand it didn’t work at all!! But this brand works very well!! 2020 27” iMac
Reviewed in the United States on December 20, 2023
Size: 128gbColor: 4 x 32GBVerified Purchase
Perfect memory upgrade for 2020 iMac 3.6 i9. Take the power cord out of the back, press the little release button, open up the perfectly blended cover, slide the cage back, remove the old memory, install the new memory, slide the cage forward, close the cover, insert the power cord, and reboot. Takes a little while for the macOS to detect the new memory, just hold your hand over the rear fan vent to confirm its working. After the first reboot, the system is working perfectly.
Reviewed in the United States on February 26, 2024
Size: 16gbColor: 2 x 8GBVerified Purchase
Super happy with this and very affordable upgrade to my i-Mac.....Better than buying a new one for $1,500!
Reviewed in the United States on February 28, 2024
Size: 128gbColor: 4 x 32GBVerified Purchase
Very easy to install. Took less than 5 minutes!
One person found this helpful
Report
Reviewed in the United States on February 25, 2024
Size: 64 GBColor: ( 4 x 16GB )Verified Purchase
Works well...seamless installation.
Reviewed in the United States on July 27, 2021
Size: 64gbColor: 2 x 32GBVerified Purchase
May 2021: Upgraded an iMac 2020 running Catalina from 8 Gb to 64 Gb. International delivery, expected this within three weeks but was quickly delivered in two. The upgrade was straightforward: unplug, place the screen face-down, open the memory door, remove original SO-DIMMs and replace with the new (slots 2 and 4). Works like a charm at 2667 MHz; not tech support needed. Following other user comments, I did not even try to use both the original and new SIMMs at the same time; may buy another 64 to max this out. End result: 64 Gb, no longer swapping although I am lately cutting it close. Very happy with the upgrade kit!

UPDATED to Novembre 2021: Decided to max it out so I ordered another round of 64. Quick international delivery, slightly different packaging, installed in slots 1 and 3 (2 and 4 already filled with 32s). Slow initial boot, all 128 Gb recognized, but speed went down to 2133 MHz? Confirmed with Novabench and Geekbench. Unexpected. Visual inspection, it turns out all 4 chips are OWC, but each pair is visibly different and comes from a different manufacturer. I contacted support and after a quick exchange of emails, I tried swapping memory around. Success! The earlier batch went into slots 1 and 2, the new batch into slots 3 and 4 - 2666 Mhz reported, and the benchmarks recover that % lost to the earlier configuration.

If I had to do this again, I would order all four chips in one go and save myself the hassle and the scare. Support responded brilliantly, thanks!
Customer image
5.0 out of 5 stars Fast delivery, works as expected - UPDATED
Reviewed in the United States on July 27, 2021
May 2021: Upgraded an iMac 2020 running Catalina from 8 Gb to 64 Gb. International delivery, expected this within three weeks but was quickly delivered in two. The upgrade was straightforward: unplug, place the screen face-down, open the memory door, remove original SO-DIMMs and replace with the new (slots 2 and 4). Works like a charm at 2667 MHz; not tech support needed. Following other user comments, I did not even try to use both the original and new SIMMs at the same time; may buy another 64 to max this out. End result: 64 Gb, no longer swapping although I am lately cutting it close. Very happy with the upgrade kit!

UPDATED to Novembre 2021: Decided to max it out so I ordered another round of 64. Quick international delivery, slightly different packaging, installed in slots 1 and 3 (2 and 4 already filled with 32s). Slow initial boot, all 128 Gb recognized, but speed went down to 2133 MHz? Confirmed with Novabench and Geekbench. Unexpected. Visual inspection, it turns out all 4 chips are OWC, but each pair is visibly different and comes from a different manufacturer. I contacted support and after a quick exchange of emails, I tried swapping memory around. Success! The earlier batch went into slots 1 and 2, the new batch into slots 3 and 4 - 2666 Mhz reported, and the benchmarks recover that % lost to the earlier configuration.

If I had to do this again, I would order all four chips in one go and save myself the hassle and the scare. Support responded brilliantly, thanks!
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5 people found this helpful
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Top reviews from other countries

Translate all reviews to English
KISHORE
5.0 out of 5 stars Ram speed
Reviewed in India on April 29, 2024
Size: 32gbColor: (2 x 16GB )Verified Purchase
Very easy to change these cards by ourselves and they are very powerful in the sense speed up your Mac
Jef
5.0 out of 5 stars Werk waar voor bedoeld is
Reviewed in the Netherlands on April 3, 2024
Size: 64gbColor: 2 x 32GBVerified Purchase
Geen opmerkingen merk werkt perfect met apple
Karta wymiata
5.0 out of 5 stars Polecam
Reviewed in Poland on November 30, 2023
Size: 32gbColor: (2 x 16GB )Verified Purchase
Mac 2019 przesiadka z 8gb na 64gb to pedał wciśnięty do dechy. Komputer zyskał turbo przy FCP X i teraz każdy kliknięcie, ruch myszką odpowiada natychmiast, .nie ma żadnego ładowania, czekania i dla tej wygody i przyjemności warto wydać pieniądze tym bardziej że teraz widać co Mac potrafi.
Można załadować kości innej firmy jednak dedykowane dają pewność że masz maszynę terminatora w domu, który będzie działać wieki.
Sama wymiana trwała 120s i jest tak prosta, że moje ją dokonać człowiek z jedną ręką.
Polecam
SOS
5.0 out of 5 stars Works well. Fast service.
Reviewed in the United Kingdom on September 18, 2023
Size: 32gbColor: 4 x 8GBVerified Purchase
We installed this RAM kit in our last-gen Intel iMac and all worked nicely.
Csodaszarvas • 🦌
5.0 out of 5 stars RAM für Mac Mini 2018 - funktioniert problemlos
Reviewed in Germany on September 16, 2023
Size: 64gbColor: 2 x 32GBVerified Purchase
Dieser RAM von OWC, wobei ich das 64 GB-Kit gekauft habe, funktioniert im Mac Mini von 2018 problemlos. Bei meinem Mac-Modell handelt es sich um die Core i5-Variante, die ursprünglich nur mit 8 GB RAM ausgeliefert wurde. Für wenig Geld und eine halbe Stunde konzentrierte Arbeit, um den Mac ordentlich zu zerlegen, den Einbau zu erledigen und anschließend wieder alles ordnungsgemäß zusammenzubauen, ist dieses RAM-Kit eine absolute Empfehlung.
Für ungeübte Bastler ist der Einbau allerdings nicht unbedingt zu empfehlen, da man unter anderem sehr kleine Torx-Sicherheitsbits benötigt und auf jeden Fall etwas Zerlegeerfahrung mitbringen sollte, um alles schadlos zu bewerkstelligen. Mit etwas Erfahrung ist der Einbau jedoch nicht wirklich schwierig. Ggf. sollte man sich ein paar Videos dazu bei einem bekannten Videoportal ansehen.

Der RAM wurde direkt nach dem Einbau beim ersten Booten voll erkannt, in der Systemübersicht korrekt angezeigt. Es waren keinerlei weitere Einstellungen notwendig. Er funktioniert seit vielen Wochen vollkommen problemlos, auch bei heftiger Auslastung des Mac mini.

Ein weiterer Pluspunkt ist die lebenslange Garantie von OWC auf diesen RAM. Für schmales Geld kann man somit einem älteren Rechner nochmals ein verlängertes Leben schenken. 64 GB RAM machen sich ggü. 8 GB RAM massiv bemerkbar, was jedoch bei Kauf schon klar einkalkuliert war.