SK Hynix HMA851S6CJR6N-VK 4GB DDR4-2666

★★★★★ 4.5 (8)

Delivering reliable 2666 MT/s DDR4 performance at standard 1.2V, this single 4GB SODIMM module is a straightforward replacement for aging laptops. Its 1Rx16 configuration and non-ECC design make it a cost-effective, drop-in upgrade for basic systems. This memory is best for users reviving older office notebooks or thin clients that only need a minimal capacity boost for web browsing and document editing.

Capacity 4GB
Kit 1 x 4GB
Memory DDR4
Speed 2666 MT/s
CAS Latency CL19
Form Factor SODIMM
SK Hynix HMA851S6CJR6N-VK 4GB DDR4-2666 ram
34 Overall Score
Also available in:

Snapshot

Pros & Cons

Pros

  • Strong affordability (86th percentile) 86th

Cons

  • Below average capacity (9th percentile)
  • Below average feature (18th percentile)

What owners think

How owner sentiment changed over time

Exclusive

Based on when customers actually wrote their reviews - so you can see whether early praise held up.

Owner sentiment has held steady over time
85/100Our AI sentiment readlow confidence · 5 sources · Oct 2026
1★2★3★4★5★Q2 '19: 5.0★ · 1 reviewQ1 '20: 5.0★ · 1 reviewQ1 '26: 5.0★ · 2 reviews (approx. date)112Q2 '19Q1 '20Q1 '26
Avg ratingHappy (4-5★)Unhappy (1-2★)Bar height = number of reviewsEstimated date

Based on 4 dated customer reviews, grouped by calendar quarter. Period analysis is in English.

The proof

Performance

Performance Percentiles

Speed 37.4
Feature 18.4
Latency 36.6
Capacity 9.2
User Sentiment 60.5
Social Proof 37.9
Affordability 86.4

Specifications

Full Specifications

Memory

Type DDR4
Form Factor SODIMM
Total Capacity 4096
Modules 1
Per Module 4096
Pins 260
Rank 1Rx16

Performance

Speed 2666
CAS Latency 19
Voltage 1.2

Class

ECC No
Registered No

Features

RGB No
Heat Spreader No

vs Competition

Spec SK Hynix HMA851S6CJR6N-VK Kingston FURY Beast KF564C32BWEAK2-64 G.Skill Trident Z5 Royal Series F5-6000J2636H32GX2-TR5NG Corsair VENGEANCE RGB CMH64GX5M2Y6400C32 Crucial Pro Overclocking CP2K16G64C32U5B Team Group T-CREATE EXPERT CTCWD532G6400HC32ADC01
Capacity 4GB 64GB 64GB 64GB 32GB 32GB
Kit 1 x 4GB 2 x 32GB 2 x 32GB 2 x 32GB 2 x 16GB 2 x 16GB
Memory Type DDR4 DDR5 DDR5 DDR5 DDR5 DDR5
Speed Mts 2666 6400 6000 6400 6400 6400
Cas Latency CL19 CL32 CL26 CL32 CL32 CL32
Form Factor SODIMM UDIMM UDIMM UDIMM UDIMM UDIMM
Ecc false false false false false false
Compare Compare Compare Compare Compare
Product SpeedFeatureLatencyCapacityUser SentimentSocial ProofAffordability
SK Hynix HMA851S6CJR6N-VK 37.418.436.69.260.537.986.4
Kingston FURY Beast KF564C32BWEAK2-64 Compare 94.789.587.689.989.692.37.6
G.Skill Trident Z5 Royal Series F5-6000J2636H32GX2-TR5NG Compare 87.489.599.189.989.674.23.3
Corsair VENGEANCE RGB CMH64GX5M2Y6400C32 Compare 94.789.587.689.997.297.86.8
Crucial Pro Overclocking CP2K16G64C32U5B Compare 94.774.887.670.977.585.628
Team Group T-CREATE EXPERT CTCWD532G6400HC32ADC01 Compare 94.774.887.670.989.692.323.3

Price

Value & Pricing

From R$898 1 offer across 1 retailer
Amazon 1 offer From R$898

Price History

R$880 R$885 R$890 R$895 R$900 Jun 13Nov 5 R$898

Usage Scores

Overall (33.8)Budget (69)Gaming (25.2)Laptop (40.7)Server (11.3)Workstation (22.3)

A full written review is coming soon. The specs, scores, prices and charts above are always up to date.

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