OWC
OWC 128GB (4 x 32GB) PC21300 DDR4 2666MHz 260pin SO-DIMMs Memory Ram Upgrade Compatible with 27 iMac w/Retina 5K (Early 2019 and up) and Compatible PCs (OWC2666DR4S128S)
Available Styles / Variations:
Current price
$838.49$6.55/GBAs of May 30, 2026 · Verify on Amazon · Price subject to change
$/GB vs DDR4 market avg
36% below avgDeal score
90/100
At $6.55/GB — 36% below the DDR4 market average.
Buy on AmazonLoad alertsVerify Alternative Stores
Our systems refresh prices daily from Amazon.com to secure the absolute lowest USD market rate. You can cross-reference this RAM kit (ASIN: B07QD13Y17) against alternative marketplaces like Newegg or Crucial before buying.
Product prices and availability are accurate as of the date of the last daily update and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply to the purchase of this product. As an Amazon Associate we earn from qualifying purchases.
At a Glance
Strengths
- 36% below the overall DDR4 market average $/GB
Limitations
- Limited review data — only 4 Amazon reviews
- Limited price history — recently added to tracking, trends not yet available
- Availability unconfirmed — may be out of stock or delisted
All points are derived from price data, customer ratings, and product specifications — not editorial opinion. Updated daily.
Is This RAM Right for You?
Based on 128GB (4x32) DDR4 SO-DIMM specifications.
Laptop RAM — suitable for gaming laptops with compatible slots
128GB handles office apps, video calls, and multiple browser tabs comfortably
128GB handles 4K video editing on a laptop — 8K workflows may need a desktop workstation
SO-DIMM laptop RAM is not used in servers — servers require DIMM or RDIMM modules
SO-DIMM form factor — correct type for laptop memory upgrades. Verify your laptop has an accessible slot.
Verdicts based on capacity, form factor, and ECC specifications — not editorial opinion. Capacity recommendations reflect 2026 software requirements.
Price History
Updated daily — track price trends over time
Current
$838.49
4d Low
$838.49
4d High
$838.49
4d Avg
$838.49
Speed Ranking
Top 46%
2666MHz ranks in the top 46% of all DDR4 speeds tracked (1,546 modules).
Specifications
Memory TypeDDR generation (DDR4 vs DDR5) · guide | DDR4 |
CapacityTotal kit memory size · guide | 128GB (4x32) |
| Kit Config | ✓ 4× kit — dual-channel ready |
SpeedFrequency in MT/s or MHz · guide | 2666MHz |
Form FactorDIMM (Desktop) vs SO-DIMM (Laptop) · guide | SO-DIMM |
ASIN | B07QD13Y17 |
Spotted a wrong price or spec? Report a data correction · How we verify data
Compatible Platforms
Always verify with your motherboard's QVL before purchasing.
DDR4 Price by Capacity
Average $/GB across all DDR4 modules in the database
| Capacity | Avg $/GB |
|---|---|
| 8GB | $9.68/GB |
| 16GB | $9.70/GB |
| 32GB | $9.02/GB |
| 64GB | $8.97/GB |
| 128GBThis product | $6.58/GB |
Upgrade Cost Calculator
How much more (or less) would you spend to step up or down in capacity? Prices shown are the cheapest available DDR4 SO-DIMM in each tier today.
Current
128GB
$838.49$6.55/GBPrices are the lowest available in each tier from our daily database — verify on Amazon before purchasing. Only DDR4 SO-DIMM modules compared.
Also available from OWC
Same brand, different configurations
OWC
OWC 16GB DDR4 RAM Compatible with Synology DiskStation DS723+ and DS923+ NAS System 2666MHz PC4-21300 CL19 ECC Unbuffered SODIMM 2Rx8 1.2V Memory Upgrade
OWC
OWC 32GB (2X16GB) DDR4 RAM Compatible with Synology DiskStation DS723+ and DS923+ NAS System 2666MHz PC4-21300 CL19 ECC Unbuffered SODIMM 2Rx8 1.2V Memory Upgrade
OWC
OWC 32GB (2x16GB) DDR4 2400MHZ PC4-19200 CL17 2RX8 Non-ECC SODIMM 1.2V 260-pin Laptop Notebook Memory RAM Upgrade Module
Related pages
Frequently Asked Questions
Is the OWC 128GB (4x32) 2666MHz DDR4 compatible with my motherboard?
This module is compatible with Laptop — DDR4 SO-DIMM. Always verify with your motherboard's QVL (Qualified Vendor List) before purchasing, as compatibility can vary by board revision.
Is this DDR4 module a good deal right now?
At $6.55/GB, this module is 36% below the overall DDR4 market average $/GB across all capacities. Deal score: 90/100. Check the price history chart above to see how the price has moved recently. Prices are updated daily from Amazon.
What is 2666MHz RAM used for?
DDR4 RAM is used in Intel LGA1200/LGA1700 and AMD AM4 (Ryzen 1000-5000) systems. It offers excellent value for existing platforms. 2666MHz is a standard DDR4 speed tier.
How does OWC RAM compare to other brands?
OWC has 89 modules tracked with an average customer rating of 4.4★. This specific module is 36% below the overall DDR4 market average $/GB. Browse all OWC modules or use the comparison tool to see how it stacks up against Corsair, G.Skill, Kingston, and Crucial.
Is 128GB of RAM enough for gaming in 2026?
128GB is more than enough for gaming in 2026. Most AAA titles use 16–24GB alongside Discord and a browser. 128GB gives you headroom for streaming, recording, and running multiple applications simultaneously.
What is the difference between a single 128GB stick and a 2×64GB kit?
This is already a 4×32GB dual-channel kit — the correct configuration for maximum performance. Dual-channel mode doubles the memory bandwidth by using both memory channels simultaneously, improving performance in games and applications by 10–30% compared to a single stick of the same total capacity.
Similar DDR4 RAM
A-Tech
A-Tech 128GB Kit (4x32GB) RAM for Apple iMac 2019 & 2020 27 inch Retina 5K | DDR4 2666 MHz SODIMM PC4-21300 / PC4-21333 260-Pin SO-DIMM Max Memory Upgrade
OWC
OWC 128GB (4x32GB) DDR4 3200MHz PC4-25600 CL22 2RX8 ECC Unbuffered SODIMM 1.2V 260-pin Memory RAM
OWC
OWC 128GB (4x32GB) DDR4 2666MHz PC4-21300 CL19 2RX8 ECC Unbuffered SODIMM 1.2V 260-pin Memory RAM
Expertly Curated by C.R. Vinoth Kumar
Lead Hardware AnalystC.R. Vinoth Kumar is a senior systems systems engineer and memory hardware architect with over 12 years of experience benchmarking computer components, building performance virtualization servers, and assembling local LLM inference rigs. Every memory module tracked in our database is mathematically checked using custom telemetry to isolate nanosecond CAS latency bounds, price-per-gigabyte market averages, and Ryzen/Intel platform pairings.
As an Amazon Associate we earn from qualifying purchases. Prices are updated daily and may change on Amazon.