OWC
OWC 64GB (4x16GB) DDR4 2666MHz PC4-21300 CL19 2RX8 ECC Unbuffered UDIMM 1.2V 288-pin Workstation Server Memory RAM
*Price sourced from Amazon.com. Last updated 2026-05-12. Price and availability subject to change.
SpecPicks Verdict
SpecPicks classifies OWC 64GB (4x16GB) DDR4 2666MHz PC4-21300 CL19 2RX8 ECC Unbuffered UDI… as a category leader on buyer feedback in the memory & ram category, based on 11 verified Amazon reviews and our ranking model that weights rating × review-volume × price-fit. OWC's positioning sits comfortably above the category median. Use the Compare tool to put it side-by-side with two or three close alternatives before clicking through to Amazon.
Common buyer scenarios for memory & ram of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the Amazon listing before purchase. Prices, stock, and Prime eligibility update directly from Amazon's catalog and may have moved since this page was last verified.
Pros & Cons
Pros
- ✓ Highly rated — 5.0★ average across customer reviews
- ✓ Backed by OWC's warranty and support channels
- ✓ Ships via Amazon with Prime eligibility and the standard returns policy
Cons
- ✗ Limited review volume so far — fewer data points on long-term reliability
- ✗ Confirm socket / form-factor / power-rating compatibility against your build before ordering
- ✗ Price, stock, and Prime eligibility update from Amazon and may have changed since this page was last verified
Key Features
- OWC 64GB UPGRADE: Consists of 4pcs of 16GB DDR4 2666MHz PC4-21300 CL19 2RX8 ECC Unbuffered DIMM 1.2V 288-pin Memory Modules
- 100% COMPLIANT: With JEDEC Standard Specifications, ROHS Compliant, Warranty Safe Upgrade. Designed and Tested to Meet or Exceed all Manufacturer OEM Specs
- INCREASED PERFORMANCE: Memory Upgrades are the Most Effective and Easy Way to Boost your PC's Performance
- INDUSTRY LEADING: Consumer Friendly Advanced Replacement Program and Limited Lifetime Warranty, which Includes Free Tech Support by Other World Computing
- Works with Desktop, Workstation and Servers like: PowerEdge, Precision, StoreEasy, ProLiant, Apollo, ThinkServer, ThinkStation, ThinkSystem, System X and more
Full Specifications
| Brand | OWC |
|---|---|
| Voltage | 1.2 Volts |
| RAM Size | 64 GB |
| Model Name | OWC |
| Form Factor | DIMM |
| Memory Speed | 2666 MHz |
| Model Number | OWC2E6D42R8064S |
| Compatibility | PC |
| 100% COMPLIANT | With JEDEC Standard Specifications, ROHS Compliant, Warranty Safe Upgrade. Designed and Tested to Meet or Exceed all Manufacturer OEM Specs |
| Number of Pins | 288 |
| Mfr Part Number | OWC2E6D42R8064S |
| INDUSTRY LEADING | Consumer Friendly Advanced Replacement Program and Limited Lifetime Warranty, which Includes Free Tech Support by Other World Computing |
| OWC 64GB UPGRADE | Consists of 4pcs of 16GB DDR4 2666MHz PC4-21300 CL19 2RX8 ECC Unbuffered DIMM 1.2V 288-pin Memory Modules |
| Memory Generation | DDR4 |
Ready to buy?
OWC 64GB (4x16GB) DDR4 2666MHz PC4-21300 CL19 2RX8 ECC Unbuffered UDIMM 1.2V 288-pin Workstation Server Memory RAM is available on Amazon with Prime shipping and the full Amazon returns policy. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.
*Price sourced from Amazon.com. Last updated 2026-05-12. Price and availability subject to change.
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