Memory Upgrades for 21.5" iMac with Retina 4K Display (2019)

Actual product may differ slightly in appearance.

OWC Memory Upgrades For 21.5" iMac with Retina 4K Display (2019)


64GB
Up to 64GB memory
2x
Up to 2x more memory vs. factory options

Works with the following Model IDs

  • iMac19,2
  • Rigorously in-house lab tested. Learn more »

  • Easy DIY install videos. Learn more »

  • OWC MaxRAM Certification. Learn more »

  • Lifetime warranty with advanced replacement. Learn more »

Works with the following Model IDs

  • iMac19,2

OWC Memory

  • This Mac has two available memory slots.
  • Install in pairs for best performance.
  • All installed memory should be the same speed for best performance.
  • Backed by an OWC Limited Lifetime Warranty.
OWC Memory
Complete Memory Kit Buying Options

2666MHz DDR4 PC4-213001 -- Maximum 64GB supported

16GB (8GB x 2) $167.07 Add to Cart
32GB (16GB x 2) $312.87 Add to Cart
64GB (32GB x 2)
$701.81 Add to Cart
Includes memory, tools, suction cups, microfiber cloth, OWC Screen Removal Tool & adhesive strips
Memory Kit Buying Options

2666MHz DDR4 PC4-213001 -- Maximum 64GB supported

Install Videos

Our step-by-step installation videos guide you through upgrading your Mac, iPhone, iPad or iPod.

View all Install Videos »

Solid State Drives

Shop SSD specifically for your iMac Experience the true speed of your mac with an OWC SSD flash storage upgrade. Select your Model ID below.

SSDs for your SYSTEM NAME

OWC General Servicing Kit for iMac

Includes all installation tools to service all Apple iMac models released since 2008.

Learn More »

OWC General Servicing Kit for iMac

0.3M (11.8") OWC Universal Thunderbolt Cable (80/120Gb/s)

0.3M (11.8") OWC Universal Thunderbolt Cable (80/120Gb/s)

Connect any device USB-C to USB-C from power to fastest Thunderbolt

Save $1.11 After Instant Rebate
Add to Cart
Apple 20W AC to USB-C Power Adapter *Brand New* Bargain!

Apple 20W AC to USB-C Power Adapter *Brand New* Bargain!

Charge iPhones, iPads, Watches, and nearly any device that charges/powers for USB

$19.00
Save $5.12
Add to Cart
OWC Mercury Elite Pro USB3/C High-Performance Enclosure

OWC Mercury Elite Pro USB3/C High-Performance Enclosure

Turn any 2.5" or 3.5" SATA Drive into your own Stylish, Speedy External!

Add to Cart
Apple Genuine AC to USB Power Block for USB powered devices

Apple Genuine AC to USB Power Block for USB powered devices

Charge iPhones, iPods, iPads, Apple Watch, cameras, mobile devices, and more! Brand New, Unused.

$19.00
Save $15.51
Add to Cart
OWC Express 1M2 DIY Portable 40Gb/s USB4 Enclosure Kit

OWC Express 1M2 DIY Portable 40Gb/s USB4 Enclosure Kit

Build your own solution for up to 3000MB/s+ speed on Apple Silicon

$119.99
Save $20 After Instant Rebate
Add to Cart
Hyper HyperDrive NET 6-in-2 USB-C Hub with Ethernet for MacBook Pro and MacBook Air (2015 or Later) - Space Gray

Hyper HyperDrive NET 6-in-2 USB-C Hub with Ethernet for MacBook Pro and MacBook Air (2015 or Later) - Space Gray

Turn two USB-C ports into 6 essential ports. Drive multiple displays, connect high-speed storage, and wired Ethernet networks. U

$39.99
Save $22 After Instant Rebate
Add to Cart
0.7M (28") OWC Universal Thunderbolt (40Gb/s) + USB-C Cable

0.7M (28") OWC Universal Thunderbolt (40Gb/s) + USB-C Cable

No guessing – connect all USB-C, Thunderbolt 3/4/5 & devices with up to 240W PD. Full Speed Always.

$24.99
Save $6
Add to Cart
32GB OWC Memory Upgrade for iMac 5K 2017-19, Mac mini '18+

32GB OWC Memory Upgrade for iMac 5K 2017-19, Mac mini '18+

The right OWC Memory More = more Performance from Apple's Intel Macs

Save $6.43
Add to Cart
0.8M (31.5") OWC Universal Thunderbolt (80/120Gb/s) Cable

0.8M (31.5") OWC Universal Thunderbolt (80/120Gb/s) Cable

Connect any device USB-C to USB-C from power to fastest Thunderbolt

$27.99
Save $3
Add to Cart
OWC Express 4M2 USB4 (40Gb/s) Enclosure for 4 x NVMe M.2 SSDs

OWC Express 4M2 USB4 (40Gb/s) Enclosure for 4 x NVMe M.2 SSDs

Build your own four-drive SSD! Easy-to-access M.2 slots + speeds up to 3200MB/s.

$239.99
Save $40 After Instant Rebate
Add to Cart
OWC Express 1M2 80G USB4 (80Gb/s) DIY Enclosure

OWC Express 1M2 80G USB4 (80Gb/s) DIY Enclosure

Add your own NVMe M.2 drive and build your own rugged, portable SSD with blazing real-world speeds over 6000MB/s!

Save $19.01 After Instant Rebate
Add to Cart
Apple Genuine USB-C to Lightning Adapter

Apple Genuine USB-C to Lightning Adapter

Use Lightning connected Accessories on newer USB-C iPhones and iPads

$29.00
Save $21.75
Add to Cart
OWC USB Type-C to Type A Port Adapter - Use existing cables

OWC USB Type-C to Type A Port Adapter - Use existing cables

Use existing USB cables to connect devices to Thunderbolt 3/USB-C port

Special Offers
Add to Cart
OWC Thunderbolt 5 Hub - More Ports + More from Each Port!

OWC Thunderbolt 5 Hub - More Ports + More from Each Port!

First in the world Thunderbolt 5 (80-120Gb/s) hub – add ports, daisy chain devices, and gain efficiency.

$219.99
Save $30
Add to Cart
2.0M (78") OWC USB-C Charging Cable

2.0M (78") OWC USB-C Charging Cable

Perfect for iPhone 15, recent iPads, most 2016+ laptops, anything C to C

$14.99
Save $8.20
Add to Cart
OWC Dual Drive Dock for SATA 2.5" and 3.5" HDs and/or SSDs

OWC Dual Drive Dock for SATA 2.5" and 3.5" HDs and/or SSDs

Built-in Power(no brick) + switch to each bay. Access & swap drives Easy

$119.99
Save $25
Add to Cart
1.0M (39.4") OWC Universal Thunderbolt (80/120Gb/s)

1.0M (39.4") OWC Universal Thunderbolt (80/120Gb/s)

Connect any device USB-C to USB-C from power to fastest Thunderbolt

Save $3
Add to Cart
OWC Thunderbolt 4 10G Ethernet Adapter

OWC Thunderbolt 4 10G Ethernet Adapter

Connect to high-speed 10G/5G/2.5G/1G/100M Ethernet networks via Thunderbolt 4 with bus-powered convenience.

Add to Cart
OWC Mercury Elite Pro mini USB-C (10Gb/s) Bus-Powered Portable Enclosure

OWC Mercury Elite Pro mini USB-C (10Gb/s) Bus-Powered Portable Enclosure

Universally USB compatible bus powered drive for saving, accessing, and backing up your work and personal life anywhere with Plu

Add to Cart
OWC 14-Port Thunderbolt Dock with Power = 1 Cable to do all

OWC 14-Port Thunderbolt Dock with Power = 1 Cable to do all

USB3 ports x 3, RJ45, Audio In/Out, SD Reader, Video & 85W Power too

$279.99
Save $100 + Bonus Offer
Add to Cart
18" NewerTech USB-A to USB Micro-B Cable

18" NewerTech USB-A to USB Micro-B Cable

Widely used for USB Chargeables & Portable Data Storage devices

$9.95
Save $9.70
Add to Cart
OWC Thunderbolt Go Dock - Beautiful on Desk & On the Go

OWC Thunderbolt Go Dock - Beautiful on Desk & On the Go

Add Thunderbolt Ports, SD Reader Network. HDMI, USBs & More - Powerful, Portable, No Power Brick!

$299.99
Save $100 After Instant Rebate
Add to Cart
OWC USB-C Travel Dock E - Bus-Powered 6-Port Portable Dock

OWC USB-C Travel Dock E - Bus-Powered 6-Port Portable Dock

The best mini-sized dock to connect, charge, display, Network, and import on-the-go via one integrated cable.

Save $5
Add to Cart
"Flip Plug/Duckhead" AC Wall Plug Adapter

"Flip Plug/Duckhead" AC Wall Plug Adapter

For Apple MagSafe/MagSafe 2, USB-C Power Adapters, AirPort Express Base Stations. *New*

$19.00
Save $14.01
Add to Cart
1.0M (39") Apple 60W USB-C to USB-C Charging Cable

1.0M (39") Apple 60W USB-C to USB-C Charging Cable

You always need one more than you have. Abrasion-resistant woven cable jacket protects this USB-C charge/sync/data cable.

Add to Cart
OWC USB-C Travel Dock 5-port Bus-Powered Portable Dock

OWC USB-C Travel Dock 5-port Bus-Powered Portable Dock

The best mini-sized dock to connect, charge, display, and import on-the-go via one integrated cable.

$49.99
Save $15
Add to Cart
NewerTech NuPower Replacement Battery Kit for 15" MacBook Pro (2013 - 2015)

NewerTech NuPower Replacement Battery Kit for 15" MacBook Pro (2013 - 2015)

Complete replacement kit including all needed tools - Restore your run time!

$94.99
Save $10
Add to Cart
1TB OWC Envoy Pro mini - Ultra-Compact, Ultra-Portable SSD

1TB OWC Envoy Pro mini - Ultra-Compact, Ultra-Portable SSD

Full-sized SSD performance in thumb-sized design. Converts from USB-C to USB-A for easy connectivity!

$349.99
Save $81 After Instant Rebate
Add to Cart
iPad 10.2" | 64GB | Wi-Fi <BR>9th Gen (2021) | Space Gray
New Item Listing
Limited Quantity

iPad 10.2" | 64GB | Wi-Fi 9th Gen (2021) | Space Gray

Plenty of storage for apps, games, and productivity. Includes Lightning Cable. Excellent Cond.

$349.00
Limited Supply, Only 7 left!
Add to Cart
16GB (2 x 8GB) OWC Memory Upgrade Kit

16GB (2 x 8GB) OWC Memory Upgrade Kit

2 x 8GB 2666MHZ DDR4 SO-DIMM PC4-21300

Save $3.75
Add to Cart
NewerTech HDMI up to 4K Headless Video Accelerator

NewerTech HDMI up to 4K Headless Video Accelerator

Higher Resolution, Performance for remote Mac access without local display. For any Mac w/HDMI port.

$19.99
Save $7
Add to Cart
iHip Bluetooth Wireless Earphones with Built-in Mic

iHip Bluetooth Wireless Earphones with Built-in Mic

They don't sound like $100 buds... but for this price, they do sound GREAT!

$24.99
Save $24.51
Add to Cart
NewerTech AdaptaDrive<BR>2.5" Drive to 3.5" Bay adapter

NewerTech AdaptaDrive2.5" Drive to 3.5" Bay adapter

Use 2.5" Hard Drive or SSD in a 3.5" Bay or Backplane!

$21.99
Save $7
Add to Cart
16GB (2 x 8GB) OWC 1600Mhz DDR3 Kit for most 2012+ Macs

16GB (2 x 8GB) OWC 1600Mhz DDR3 Kit for most 2012+ Macs

For iMac, Mac mini, and MacBook Pro (non-Retina). Upgrade RAM for more performance!

Save $3.20
Add to Cart
OWC Memory Installation Toolkit for Mac mini (2018 - Current)

OWC Memory Installation Toolkit for Mac mini (2018 - Current)

Complete kit with all the tools you need to open the Mac mini & install memory.

$12.99
Save $7
Add to Cart
2.0M (78") OWC Universal Thunderbolt (40Gb/s) + USB-C

2.0M (78") OWC Universal Thunderbolt (40Gb/s) + USB-C

Connect any USB-C to USB-C: Thunderbolt, Power, USB - Always

Save $2
Add to Cart
2.0M (11.8") OWC Universal Thunderbolt Cable (80/120Gb/s)

2.0M (11.8") OWC Universal Thunderbolt Cable (80/120Gb/s)

Connect any device USB-C to USB-C from power to fastest Thunderbolt

Add to Cart
Apple AC to USB Compact<BR>Wall Charger for iDevices

Apple AC to USB CompactWall Charger for iDevices

Charge iPhones, iPods, iPads, nearly anything that powers via USB. *Used*

$19.00
Save $17.51
Add to Cart
0.5M (20") 100W USB-C Extension Cable – Certified 10Gb/s

0.5M (20") 100W USB-C Extension Cable – Certified 10Gb/s

Extend any USB-C 10Gb/s or Charging cable with full power & data

Add to Cart
OWC Thunderbolt 5 Dock: High performance 11-Port Dock

OWC Thunderbolt 5 Dock: High performance 11-Port Dock

Adds 3 x Thunderbolt 5 ports, 2.5Gbe, USB-C, USB-A, Audio, Card Reader, +

Add to Cart
NewerTech Dual-Port 60W Charger USB-C and USB-A

NewerTech Dual-Port 60W Charger USB-C and USB-A

Smart Charge/Power Laptop, iPad, etc via USB-C + another device USB-A

$39.00
Save $31.75
Add to Cart
iHip Bluetooth Wireless Earphones with Built-in Mic

iHip Bluetooth Wireless Earphones with Built-in Mic

They don't sound like $100 buds... but for this price, they do sound GREAT!

$24.99
Save $22
Add to Cart
OWC USB 3.0 Express 2.5" Enclosure Kit for SSD or HD

OWC USB 3.0 Express 2.5" Enclosure Kit for SSD or HD

Sleek, Discrete Black, Portable Bus-Powered USB 3.0 Kit

$19.99
Save $5
Add to Cart
OWC Thunderbolt 3 to 10G Ethernet Adapter
Limited Quantity

OWC Thunderbolt 3 to 10G Ethernet Adapter

Bus powered, blazing-fast 10Gb/s Ethernet connectivity for Mac and PC.

$199.99
Limited Supply, Only 4 left!
Add to Cart
OWC Portable Thunderbolt Dock Dual 4K HDMI, Ethernet, USB x 2

OWC Portable Thunderbolt Dock Dual 4K HDMI, Ethernet, USB x 2

*Bus Powered, Go Anywhere, Plug and Play Dock for Mac, PC, iPad Pro

Add to Cart
OWC Elite Dual Pro USB3 RAID Enclosure Kit for 3.5" Drives

OWC Elite Dual Pro USB3 RAID Enclosure Kit for 3.5" Drives

Build your own RAID 0/1/SPAN/JBOD external drive up to 48TB or more

Add to Cart
360E Profile GaN 4-Port 160W Power Charger. Fast, Compact!

360E Profile GaN 4-Port 160W Power Charger. Fast, Compact!

Exceptional charging power to single or across 3 x USB-C and 1 x USB-A

$99.95
Save $64.96
Add to Cart
OWC Mercury Elite Pro Quad RAID 5 4-Bay Enclosure

OWC Mercury Elite Pro Quad RAID 5 4-Bay Enclosure

Speeds over 900MB/s with 4 x 3.5" HDD or 2.5" SSD/HDD. RAID-READY

Add to Cart
2TB OWC Envoy Ultra – Ultra-Fast, Ultra-Portable SSD

2TB OWC Envoy Ultra – Ultra-Fast, Ultra-Portable SSD

The first and fastest Thunderbolt 5 portable SSD. Over 6000MB/s – up to 2x faster than Thunderbolt 4 and USB4!

$19,998.99
Save $19,199
Add to Cart
OWC Thunderbolt Hub - Add Additional Thunderbolt Ports

OWC Thunderbolt Hub - Add Additional Thunderbolt Ports

More Powered Thunderbolt / USB-C for More Devices, Faster Connect

$169.99
Save $20
Add to Cart
64GB Memory Upgrade for select 2018 & Later Macs

64GB Memory Upgrade for select 2018 & Later Macs

Max out your Mac mini 'Intel' 2018-21 or Add In More to iMac 2017-2020 5K 27". More OWC RAM = FASTER Mac

Save $14.49
Add to Cart
27" Apple Studio Display with Tilt Adjustable Stand
Limited Quantity

27" Apple Studio Display with Tilt Adjustable Stand

5K (14.7M+ pixels), 12MP ultrawide camera, studio-quality mic array, 6-speaker spatial audio. Like New/Mint Cond.

$1,599.00
Limited Supply, Only 9 left!
Add to Cart
Apple Genuine 30 Watt USB-C Power Adapter (Used/Excellent)

Apple Genuine 30 Watt USB-C Power Adapter (Used/Excellent)

For 12-inch Macbook, 13-inch Macbook Air (2018+), iPad, iPhone and more.

$39.00
Save $9.12
Add to Cart
OWC ThunderBay 4 Enclosure for 4 x SATA Drives with Dual Thunderbolt (40Gb/s)

OWC ThunderBay 4 Enclosure for 4 x SATA Drives with Dual Thunderbolt (40Gb/s)

One of our most popular! Add your own 2.5" or 3.5" SATA drives and create your own solution! RAID ready.

Add to Cart
1.0M (39") Apple Watch Magnetic Fast Charger with Braided Cable

1.0M (39") Apple Watch Magnetic Fast Charger with Braided Cable

Amazing price on a genuine Apple Watch Charger. Like New/Mint Cond.

$29.00
Save $16.12
Add to Cart
0.9M (36") Premium Quality, Braided Lightning to USB

0.9M (36") Premium Quality, Braided Lightning to USB

Incredible Quality you'll Love! Charge and sync all lightning devices. Made for iPhones, iPads, and iPods.

$19.99
Save $15.74
Add to Cart
NewerTech NuPower 72 Watt-Hour Replacement Battery Kit
Limited Quantity

NewerTech NuPower 72 Watt-Hour Replacement Battery Kit

Restore your run time! Complete replacement kit for 13" MacBook Pro (L2013-2015)

$84.99
Limited Supply, Only 17 left!
Add to Cart
2TB OWC Express 1M2 Portable SSD

2TB OWC Express 1M2 Portable SSD

Bus-powered & pocket sized with speeds over 3000MB/s!

$10,118.99
Save $9,419
Add to Cart
OWC Mount Pro 2.5" Mac Pro for proper, direct slide in

OWC Mount Pro 2.5" Mac Pro for proper, direct slide in

2.5" Drive Sled Designed forthe Apple Mac Pro 3.5" Drive Bays

$14.99
Save $2
Add to Cart
OWC Gemini Dual-Bay RAID Thunderbolt Enclosure & Dock

OWC Gemini Dual-Bay RAID Thunderbolt Enclosure & Dock

DIY - Add your own 3.5" HDD, 2.5" HDD/SSD or U.2 NVMe drives.

Add to Cart
OWC USB 2 Express HD 2.5" Enclosure Kit - Bus Powered
Limited Quantity

OWC USB 2 Express HD 2.5" Enclosure Kit - Bus Powered

For 2.5" Serial ATA Hard DrivesBus-Powered Portable Kit

$12.99
Limited Supply, Only 12 left!
Add to Cart
OWC 10' USB-C to C 40Gb/s Optical for Thunderbolt & USB4

OWC 10' USB-C to C 40Gb/s Optical for Thunderbolt & USB4

Enjoy reliable data up to 40Gb/s + up 240W Power Delivery with OWC Adv

$98.99
Save $19 After Instant Rebate
Add to Cart
OWC Mercury Elite Pro Dual RAID + Hub: Digital Desktop Centerpiece

OWC Mercury Elite Pro Dual RAID + Hub: Digital Desktop Centerpiece

Add up to two 3.5" or 2.5" drives (SSD or HDD) + connect more devices with built-in hub!

Add to Cart
8TB OWC Express 1M2 80G (Thunderbolt 5 Compatible)

8TB OWC Express 1M2 80G (Thunderbolt 5 Compatible)

The Fastest 8TB Bus-Powered, portable SSD Ever - 6000MB/s+

$10,218.00
Save $7,788.01
Add to Cart
3.2GHz | M1 Pro Late 2021 Model ID: MacBookPro18,1
16" MacBook Pro M1 Pro | 16GB RAM | 512GB SSD | 16-Core GPU
Limited Quantity

16" MacBook Pro M1 Pro | 16GB RAM | 512GB SSD | 16-Core GPU

Thunderbolt 4, 10-core CPU, 16-core GPU, 16-core Neural Engine. Excellent Cond. + 1 Year Warranty

$2,499.00
Limited Supply, Only 5 left!
Add to Cart
16TB OWC ThunderBay 4 Enterprise RAID with Dual Thunderbolt (40Gb/s)

16TB OWC ThunderBay 4 Enterprise RAID with Dual Thunderbolt (40Gb/s)

Massive 4-drive storage with SoftRAID – up to 35% faster software RAID!

$5,080.00
Save $3,100.01
Add to Cart
High-Quality USB 3 Cable<BR>At a Surplus, Bargain Price

High-Quality USB 3 CableAt a Surplus, Bargain Price

18" Length. Gold Plated. USB Type-A to B Cable. Also works for USB 2.0 too

$14.95
Save $12.96
Add to Cart
  1. PC4-21300 DDR4 2666MHz SO-DIMMs will operate at 2400MHz speeds in iMac19,2 models with 3.6GHz Quad-Core i3 Processor. This memory will operate at full 2666MHz speeds in other iMac19,2 models.