21.5" iMac with Retina 4K & Non-Retina Display (2017) memory upgrades

Actual product may differ slightly in appearance.

OWC Memory Upgrades For 21.5" iMac with Retina 4K & Non-Retina Display (2017)


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

Works with the following Model IDs

  • iMac18,2
  • iMac18,1
  • 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

  • iMac18,2
  • iMac18,1

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

2400MHz DDR4 PC3-19200 -- 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

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
1.0M Apple Genuine USB-C to C Charge and Sync Cable

1.0M Apple Genuine USB-C to C Charge and Sync Cable

Apple Genuine quality, flexible & stylish braided USB-C to C cable.

$19.00
Save $14.12
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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

$19.99
Save $5 After Instant Rebate
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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 $8 After Instant Rebate
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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 $40 After Instant Rebate
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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 $16.75
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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 $7.50 After Instant Rebate
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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, +

$329.99
Save $50 After Instant Rebate
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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

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
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

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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
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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
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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
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18.0TB WD UltraStar 7200RPM Enterprise HDD 512MB Cache
Limited Quantity

18.0TB WD UltraStar 7200RPM Enterprise HDD 512MB Cache

High Performance 3.5" SATA Enterprise HDD. 2yr OWC Warranty

$799.99
Limited Supply, Only 21 left!
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OWC Mercury Pro 16X Blu-ray, DVD, CD Read/Write External

OWC Mercury Pro 16X Blu-ray, DVD, CD Read/Write External

Data, Music, create playable Photo & Video discs - Play, Archive, Share. Easy Plug & Play and go via USB

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
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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
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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

$59.99
Save $10 After Instant Rebate
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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 $8.41
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2.0GB Kit PC3200 DDR 184 Pin DIMMs

2.0GB Kit PC3200 DDR 184 Pin DIMMs

For PowerMac G5 Models w/PCI Slots, PCs

Save $1
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1.0M (39") Apple Genuine USB-C to Lighting Cable

1.0M (39") Apple Genuine USB-C to Lighting Cable

Great saving on Excellent condition Apple USB-C to Lightning Cable

$19.00
Save $10.02
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.

Save $11 After Instant Rebate
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OWC Gemini Dual-Bay RAID Thunderbolt Enclosure & Dock

OWC Gemini Dual-Bay RAID Thunderbolt Enclosure & Dock

2 x SATA or NVMe SSD + SD, USB 3, 2.5Gbe, HDMI, and more docking

$299.99
Save $51.24
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iPad 10.2" | 32GB | Wi-Fi <BR>8th Generation | Space Gray

iPad 10.2" | 32GB | Wi-Fi 8th Generation | Space Gray

Includes iPad and Lightning to USB-C Cable. Excellent Cond.

$329.00
Save $190 After Instant Rebate
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32GB iPod Touch *Latest* Special find, *Brand New*

32GB iPod Touch *Latest* Special find, *Brand New*

Built-in speaker, mic, 8MP camera, Lightning + *headphone jack*

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.

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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
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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
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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!

$219.00
Save $44.01 After Instant Rebate
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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
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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
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OWC Thunderbolt Hub - Add Additional Thunderbolt Ports

OWC Thunderbolt Hub - Add Additional Thunderbolt Ports

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

Add to Cart
1.0TB OWC Envoy USB-C SSD<BR>Super SPEED @ SUPER Price!

1.0TB OWC Envoy USB-C SSDSuper SPEED @ SUPER Price!

Get incredible 1000MB/s Speed, Reliability from OWC's tiny performer!

Save $15.11
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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

$94.99
Save $15
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4TB OWC Envoy Ultra – Ultra-Fast, Ultra-Portable SSD

4TB 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 $18,849
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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
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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
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2.0TB Seagate 7200RPM 3.5" SATA III 6Gb/s w/256GB Cache

2.0TB Seagate 7200RPM 3.5" SATA III 6Gb/s w/256GB Cache

Nice Capacity, Great Performance from this 3.5" Performance Hard Drive with 2 Year Seagate Warranty.

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
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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
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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 $4.27
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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 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.

$199.99
Save $30 After Instant Rebate
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16.0TB Seagate Exos X18 Enterprise 7200RPM SATA HD
New Price

16.0TB Seagate Exos X18 Enterprise 7200RPM SATA HD

High-Performance 3.5" HDD with 256GB Cache. OWC Certified w/2yr

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NewerTech USB Universal Drive Adapter

NewerTech USB Universal Drive Adapter

Reuse or access data from just about any 2.5", 3.5" or 5.25" drive via USB!

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
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 $45 After Instant Rebate
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Apple Magic Keyboard 2 - connect and/or charge via USB

Apple Magic Keyboard 2 - connect and/or charge via USB

Use Wirelessly or while charging, or just plain straight wired up. Magic 2

$99.00
Save $29.01
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3.0M (118") NewerTech Premium Lightning Cable (Pink)
Limited Quantity

3.0M (118") NewerTech Premium Lightning Cable (Pink)

Built to last, braided casing for extra durability. *Rare Long Length Cable*

$39.95
Limited Supply, Only 19 left!
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16GB (2 x 8GB) OWC 1333Mhz DDR3 for most 2010-2011 Macs

16GB (2 x 8GB) OWC 1333Mhz DDR3 for most 2010-2011 Macs

For most Apple iMac 2010-2011, MacBook Pro 2011,and Mac mini 2011

Save $3.20
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Apple Genuine USB to Lightning Cable *Special Edition Black*

Apple Genuine USB to Lightning Cable *Special Edition Black*

These are new units that originally came special with the Apple iMac Pro. Not sold separately by Apple.

$19.00
Save $11.01
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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
Apple Genuine 140 Watt USB-C Power Adapter/Charger

Apple Genuine 140 Watt USB-C Power Adapter/Charger

Charge/power nearly any USB-C device up to the latest MacBook Pro. Excellent Cond.

$99.00
Save $24.01 + Bonus Offer
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3.2GHz | M1 Late 2020 Model ID: MacBookAir10,1
13" MacBook Air M1 8-Core <BR>16GB RAM | 512GB SSD | 8-Core GPU
Limited Quantity

13" MacBook Air M1 8-Core 16GB RAM | 512GB SSD | 8-Core GPU

Upgraded 8-Core GPU, Light, Long Battery. Very Good Cond. + 1 Year Warranty

$1,449.00
Limited Supply, Only 5 left!
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OWC Envoy Pro Enclosure for MacBook Pro 2012-e13 drives

OWC Envoy Pro Enclosure for MacBook Pro 2012-e13 drives

Take the SSD from MacBook Pro Retina 2012 to Early 13 Models and make external for transfer/use

$5,000.00
Save $4,940.01
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OWC Mercury On-The-Go Pro Bus-Powered for 2.5" HDD | SSD

OWC Mercury On-The-Go Pro Bus-Powered for 2.5" HDD | SSD

Rugged, SuperSpeed USB3, classic enclosure of exceptional reliability

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120GB OWC Mercury Electra  2.5" SATA SSD for Mac (& PC)

120GB OWC Mercury Electra 2.5" SATA SSD for Mac (& PC)

Over 500MB/s Read and Write - Exceptional Performance at great price

Save $2 + Bonus Offer
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48TB OWC ThunderBay 4 Enterprise RAID with Dual Thunderbolt (40Gb/s)

48TB OWC ThunderBay 4 Enterprise RAID with Dual Thunderbolt (40Gb/s)

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

$5,160.00
Save $2,660.01
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Matias Extended Aluminum Wired Keyboard - Silver

Matias Extended Aluminum Wired Keyboard - Silver

Designed for Mac. Sleek, Beautiful + Mac Specific function keys and precision volume control dial

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