Current price
$39.97$9.99/GBAs of 28 Aug 2026, 06:40 UTC ยท Verify on Amazon ยท Price subject to change
Good time to buy
Price is near its tracked low of $36.94 โ in the bottom 20% of its recorded range. ยท $9.99/GB
As an Amazon Associate I earn from qualifying purchases. Prices as of 28 Aug 2026, 06:40 UTC. Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product.
SK Hynix
SK hynix HMA851S6CJR6N - VK Non ECC PC4-2666V 4GB DDR4 at 2666MHz 260pin SDRAM SODIMM Single Kit Laptop Memory - OEM (HMA851S6CJR6N VK)
This SK Hynix 4GB 2666MHz DDR4 ECC SO-DIMM laptop kit is $39.97 ($9.99/GB), near its tracked low. In stock on Amazon. Fits Laptop โ DDR4 SO-DIMM. HMA851S6CJR6N VK variant.
Variations
At a Glance
Strengths
- 4.7โ rating across 551 Amazon reviews
- Price near its tracked low of $36.94
All points are derived from price data, customer ratings, and product specifications โ not editorial opinion. Updated daily.
Specifications
Catalog data as of 28 Aug 2026, 06:40 UTC
Memory TypeDDR generation (DDR4 vs DDR5) ยท guide | DDR4 |
CapacityTotal kit memory size ยท guide | 4GB |
SpeedFrequency in MT/s or MHz ยท guide | 2666MHz |
Form FactorDIMM (Desktop) vs SO-DIMM (Laptop) ยท guide | SO-DIMM |
ECCError-correcting capability ยท guide | Yes |
ASIN | B07GH7RRTM |
Spotted a wrong price or spec? Report a data correction ยท How we verify data
Specs & prices refreshed 28 Aug 2026, 06:40 UTC. Verify on Amazon at checkout.
Price History
Updated daily โ track price trends over time
Current
$39.97
92d Low
$36.94
92d High
$105.05
92d Avg
$47.43
Deal score
64/100
vs this kit's history
Current price is 0.4ฯ below the tracked average of $47.43 - within a normal band for this ASIN.
Frequently Asked Questions
Is the SK Hynix 4GB 2666MHz DDR4 compatible with my motherboard?
This module is compatible with Laptop โ 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?
Yes โ Price is near its tracked low of $36.94 โ in the bottom 20% of its recorded range. At $39.97 ($9.99/GB). Prices are updated daily from Amazon.
What is 2666MHz RAM used for?
This is an ECC (Error-Correcting Code) RAM module designed for servers, workstations, and NAS systems where data integrity is critical. ECC RAM detects and corrects single-bit memory errors automatically. It requires a compatible CPU and motherboard โ most consumer platforms do not support ECC. See our ECC RAM guide for platform compatibility details.
How does SK Hynix RAM compare to other brands?
SK Hynix has 90 modules tracked with an average customer rating of 4.4โ . Browse all SK Hynix modules or use the comparison tool to see how it stacks up against Corsair, G.Skill, Kingston, and Crucial.
What is the difference between a single 4GB stick and a matched multi-stick kit?
A single 4GB stick runs in single-channel mode. A matched 2ร2GB kit of the same total capacity enables dual-channel mode, doubling memory bandwidth and typically improving real-world performance by 10โ30%. For best results, buy RAM in matched kits.
Similar DDR4 RAM
Samsung
Samsung 4GB DDR4 3200MHz PC4-25600 1.2V 1R x 16 SODIMM Laptop RAM Memory Module M471A5244CB0
SK Hynix
SK Hynix 4GB DDR4 3200MHz PC4-25600 1.2V 1R x 16 SODIMM Laptop RAM Memory Module HMA851S6CJR6N-XN, OEM Package
Compatibility & buying details
Use cases, platforms, motherboard notes, upgrade math, and analyst notes
Compatibility & buying details
Use cases, platforms, motherboard notes, upgrade math, and analyst notes
Is This RAM Right for You?
Based on 4GB DDR4 ECC SO-DIMM specifications.
Laptop RAM โ suitable for gaming laptops with compatible slots
4GB is below the recommended minimum for comfortable everyday use
ECC RAM protects long renders from silent data corruption โ ideal for professional workstations
ECC RAM detects and corrects memory errors โ required for data-critical servers and ZFS storage
SO-DIMM form factor โ correct type for laptop memory upgrades. Verify your laptop has an accessible slot.
Verdicts based on capacity, form factor, and ECC specifications โ not editorial opinion. Capacity recommendations reflect 2026 software requirements.
Enterprise ECC Stability
Validated by C.R. Vinoth Kumar ยท Founder & Senior Editor
This is an Error Correcting Code (ECC) server module designed to prevent silent data corruption in 24/7 server environments (like TrueNAS/ZFS or enterprise workloads). Ensure your motherboard and CPU officially support ECC before purchasing.
Price Range
Tracked low
$36.94Current
$39.97Tracked high
$105.05โ Near tracked low
Speed Ranking
Top 46%
2666MHz ranks in the top 46% of all DDR4 speeds tracked (2,032 modules).
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 |
|---|---|
| 4GBThis product | $9.75/GB |
| 8GB | $8.10/GB |
| 16GB | $7.81/GB |
| 32GB | $7.44/GB |
| 64GB | $7.81/GB |
| 128GB | $7.42/GB |
Also available from SK Hynix
Same brand, different configurations
SK Hynix
Hynix 8GB PC4-21300 DDR4-2666MHz 260-Pin SODIMM 1.2V Single Rank Memory Module HMA81GS6CJR8N-VK
SK Hynix
SK HYNIX 16GB 2RX8 DDR4 SO-DIMM PC4-21300 2666MHZ Memory Module HMA82GS6JJR8N-VK
Related pages
Amazon prices on this page. ASIN B07GH7RRTM may also appear on Newegg - we do not show competitor prices.
Reviewed by C.R. Vinoth Kumar
Editor & FounderVinoth is an InfoSec consultant, independent technical blogger, and the developer of RAM Prices, with 12+ years in IT. He reviews buying guides and maintains the site's automated checks for price per GB, specification confidence, availability, and AMD/Intel platform compatibility. See the methodology for the exact ranking rules and limitations.
As an Amazon Associate I earn from qualifying purchases. Prices as of 28 Aug 2026, 06:40 UTC. Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product.