OWC
OWC 4GB (4x1GB) DDR2 667 PC2-5300 CL5 1Rx8 240-pin 1.8V Non-ECC UDIMM Memory RAM Module Upgrade Kit for Select Desktops
*Price sourced from Amazon.com. Last updated 2026-05-12. Price and availability subject to change.
OWC DDR2 memory is Fully compliant with JEDEC specifications, ROHS compliant, providing a warranty safe upgrade. OWC Memory is the most cost effective and simple DIY upgrade you can install to unleash your Mac or PC's full potential and speed up overall responsiveness. Become a multitasking maven when you upgrade your Mac or PC with OWC Memory. Open more apps. Open larger files. Plus, work with multiple files all at the same time. We test every OWC memory module at our in house lab so you can upgrade with the confidence that your memory is built to last. We built your OWC Memory upgrade to me…
SpecPicks Verdict
SpecPicks classifies OWC 4GB (4x1GB) DDR2 667 PC2-5300 CL5 1Rx8 240-pin 1.8V Non-ECC UDIMM… as a niche pick — read recent reviews before buying in the memory & ram category, based on limited Amazon review volume so far and our ranking model that weights rating × review-volume × price-fit. OWC's positioning sits within the broader category mid-tier. 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
- ✓ Backed by OWC's warranty and support channels
- ✓ Ships via Amazon with Prime eligibility and the standard returns policy
Cons
- ✗ 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 4GB UPGRADE: Consists of 4pcs of 1GB DDR2 667 PC2-5300 CL5 1Rx8 240-pin 1.8V Non-ECC Unbuffered DIMM Memory RAM Module Upgrade Kit for Select Desktops.
- 100% COMPLIANT: JEDEC-Standard and 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.
- EASY INSTALLATION: In Most Cases, Installing Memory is an Easy DIY project. Watch our OWC Basic Installation Video for Help.
Full Specifications
| Brand | OWC |
|---|---|
| Voltage | 1.8 Volts (DC) |
| RAM Size | 4 GB |
| Form Factor | Desktop |
| Memory Speed | 667 MHz |
| Model Number | OWC5U3D21R8004S-B959-SF |
| Compatibility | PC |
| 100% COMPLIANT | JEDEC-Standard and ROHS Compliant. Warranty-Safe Upgrade. Designed and Tested to Meet or Exceed all Manufacturer OEM Specs. |
| Number of Pins | 240 |
| Mfr Part Number | OWC5U3D21R8004S-B959-SF |
| OWC 4GB UPGRADE | Consists of 4pcs of 1GB DDR2 667 PC2-5300 CL5 1Rx8 240-pin 1.8V Non-ECC Unbuffered DIMM Memory RAM Module Upgrade Kit for Select Desktops. |
| INDUSTRY LEADING | Consumer-friendly Advanced Replacement Program and Limited Lifetime Warranty, which includes Free Tech Support by Other World Computing. |
| EASY INSTALLATION | In Most Cases, Installing Memory is an Easy DIY project. Watch our OWC Basic Installation Video for Help. |
| Compatible Devices | Desktop |
Ready to buy?
OWC 4GB (4x1GB) DDR2 667 PC2-5300 CL5 1Rx8 240-pin 1.8V Non-ECC UDIMM Memory RAM Module Upgrade Kit for Select Desktops 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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