OWC Confirms Availability of 256GB Memory for iMac Pro

Savings up to 52% vs. highest Apple factory option

Apr 23, 2019 | Woodstock, IL


OWC®, a leading zero emissions Mac and PC technology company and one of the world’s most respected creators of SSDs, Thunderbolt external drives, PC & Mac docking solutions and performance upgrade kits, announces support for 256GB memory upgrades for iMac Pro (2017 – Current) 8X the factory standard memory in the 3.2GHz, 32GB base model. These high-performing memory kits empower iMac Pro owners to boost performance levels and run more apps, work with larger files, speed up render times, and manipulate larger data sets.

For almost the cost of what Apple charges for the iMac Pro with 128GB of memory, iMac owners can instead max out their rig with 256GB of OWC Memory. OWC Memory is certified and guaranteed for life, to deliver maximum compatibility and performance. This new 256GB memory kit is comprised of 4 x 64GB LRDIMMs (Load Reduced) for memory intensive applications and is OWC certified for iMac Pro (27-inch Late 2017).

Availability and Pricing

OWC Memory Kits for the iMac Pro are available for same day shipping via OWC Memory Upgrades.

OWC DDR4 Kits for the iMac Pro (2017 – Current) models:

  • 64GB Kit (16GB x 4) OWCDID2627DS64T - $699.00
  • 128GB Kit (32GB x 4) OWCDID2627DS128 - $1,149.00
  • 128GB Kit (64GB x 2) OWCDID2627DP128 - $1,299.00
  • 256GB Kit (64GB x 4) OWCDID2627DS256 - $2,499.00

Due to the complexity of upgrades on the iMac Pro, OWC recommends users have an OWC certified technician install the memory upgrade. Users in the contiguous 48 US states will see free shipping options appear in their cart when they order. iMac Pro owners can also trade in their existing memory for even greater savings on their OWC iMac Pro memory upgrade.

MaxRAM Memory Certification Program OWC memory modules and kits are fully tested, qualified, and MaxRAM Certified to ensure flawless operation. The OWC MaxRAM Certification Program determines the maximum amount of memory that can be utilized in specific Macs as validated by comprehensive, in-house laboratory tests. All OWC memory has a Lifetime Advance Replacement Warranty and Money Back Guarantee.

OWC is THE Trusted Name in Mac Memory offers OWC memory upgrades for nearly every current and past Apple notebook and desktop computer manufactured during the past two decades, including iMac, iMac Pro, MacBook, MacBook Pro, and Mac Pro. By maintaining a state-of-the-art test lab, OWC ensures its memory upgrades offer the highest product quality and reliability, backing them with an OWC Lifetime Advance Replacement Program and 30-Day Money Back Guarantee. If you need help maximizing your iMac, OWC offers 24/7 customer support, free 800 call-in technical support and free online videos to make upgrading easy.


  • macOS 10.14.3 Mojave or later must be installed before installing any kits utilizing 64GB memory modules.
  • Apple iMac Pro can use either RDIMM or LRDIMM, but they cannot be combined. The system will not function with a mixed configuration. For maximum performance, population of all 4 DIMM slots is recommended.
  • Professional Installation Required! The iMac Pro DOES NOT feature a memory door on the back allowing for easy upgrades. Upgrading the iMac Pro's memory requires dismantling the computer to gain access to the memory slots. This is a highly complex process that requires a skilled technician.


About OWC

Other World Computing (OWC), founded in 1988, is dedicated to helping Mac and PC enthusiasts do more and reach higher. We believe in sustainability – OWC solutions are genuinely built to last, go the distance, and enable users to maximize the technology investment they have already made. OWC's operation provides leadership in business sustainability, with its headquarters among the first in the world awarded LEED Platinum certification. OWC features an award-winning technical support team and an unparalleled library of step-by-step DIY and informational videos. From the home desktop to the enterprise rack, the corporate backup to secure medical data, the recording studio to the motion picture set, and beyond, there should be no compromise. That is why OWC is here.

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Company Contact

Matt Burkey