Average Bench: 78.2% (58th of 113)

Based on 1,022 user benchmarks.  Model: Corsair CM4X8GF2666C16K4 2x8GB

Good average bench

The Corsair CM4X8GF2666C16K4 2x8GB averaged 21.8% lower than the peak scores attained by the group leaders. This is an excellent result which ranks the Corsair CM4X8GF2666C16K4 2x8GB near the top of the comparison list.


Avg. 16 Core Read Bench 30.7GB/s
Avg. 16 Core Write Bench 28.9GB/s

Above average consistency

The range of scores (95th - 5th percentile) for the Corsair CM4X8GF2666C16K4 2x8GB is 30.1%. This is a relatively narrow range which indicates that the Corsair CM4X8GF2666C16K4 2x8GB performs reasonably consistently under varying real world conditions.


Avg. 1 Core Read Bench 18.2GB/s
Avg. Physical RAM Latency 67.1ns

Average Bench

(Based on 1,022 samples)
Min Avg Max
22.5 MC Read 30.7 36
18.7 MC Write 28.9 34.8
18.6 MC Mixed 23.6 30.2
79.2% 27.7 GB/s
Min Avg Max
12.7 SC Read 18.2 23.2
17 SC Write 27.7 35.6
15.1 SC Mixed 24 29.2
66.7% 23.3 GB/s
Min Avg Max
55.2 Latency 67.1 97.4
59.6% 67.1 ns
User Benchmarks Bench Multi core Single core Latency
The fastest RAM (mainstream) averages a speed of 100%
2 of 4 slots used
16GB DIMM DDR4 clocked @ 3000 MHz
MC Read 36.3
MC Write 35.7
MC Mixed 25.5
93% 32.5 GB/s
SC Read 22.1
SC Write 39
SC Mixed 29.2
86% 30.1 GB/s
Latency 50.6
79% 50.6 ns
2 of 4 slots used
16GB DIMM DDR4 clocked @ 2667 MHz
MC Read 29.4
MC Write 29.4
MC Mixed 22.5
77% 27.1 GB/s
SC Read 18.6
SC Write 30.8
SC Mixed 24.8
71% 24.7 GB/s
Latency 59.7
67% 59.7 ns
2 of 4 slots used
16GB DIMM DDR4 clocked @ 2733 MHz
MC Read 27.8
MC Write 25.1
MC Mixed 21.4
71% 24.8 GB/s
SC Read 14.1
SC Write 14.6
SC Mixed 16.9
43% 15.2 GB/s
Latency 74.3
54% 74.3 ns
1,022 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 32,919,611 RAM Kits tested.

Typical CM4X8GF2666C16K4 2x8GB Builds (Compare 1,232 builds) See popular component choices, score breakdowns and rankings.
Gaming 77%
Desktop 88%
Aircraft carrier
Workstation 65%

Motherboard: Asus TUF B360-PLUS GAMING - $105

EDIT WITH CUSTOM PC BUILDER Value: 71% - Very good Total price: $601

Popular CM4X8GF2666C16K4 2x8GB compatible motherboards:

How Fast Is Your RAM? (Bench your build) Size up your PC in less than a minute.

Welcome to our freeware PC speed test tool. UserBenchmark will test your PC and compare the results to other users with the same components. You can quickly size up your PC, identify hardware problems and explore the best upgrades.

UserBenchmark of the month

How it works

  • - Download and run UserBenchMark.
  • - CPU tests include: integer, floating and string.
  • - GPU tests include: six 3D game simulations.
  • - Drive tests include: read, write, sustained write and mixed IO.
  • - RAM tests include: single/multi core bandwidth and latency.
  • - Reports are generated and presented on userbenchmark.com.
  • - Identify the strongest components in your PC.
  • - See speed test results from other users.
  • - Compare your components to the current market leaders.
  • - Explore your best upgrade options with a virtual PC build.
  • - Compare your in-game FPS to other users with your hardware.
  • - Share your opinion by voting.
Memory Kit Rankings (Price vs Performance) September 2020 RAM Rankings.

We calculate effective RAM speed which measures performance for typical desktop users. Effective speed is adjusted by current cost per GB to yield value for money. Our calculated values are checked against thousands of individual user ratings. The customizable table below combines these factors to bring you the definitive list of top Memory Kits. [RAMPro]


Group Test Results

  • Best user rated - User sentiment trumps benchmarks for this comparison.
  • Best value for money - Value for money is based on real world performance.
  • Fastest real world speed - Real World Speed measures performance for typical consumers.


113 Memory Kits (Compared) Thousands of user benchmarks compiled into one comparison list.

See how consistently different RAM Kits perform with varying real world conditions. The charts also illustrate overall performance, popularity and rank.

 Frequently Asked Questions

 Best User Rated

The Best.
Intel Core i5-9600K $195Nvidia GTX 1660S (Super) $230Crucial MX500 250GB $45
Intel Core i5-9400F $140Nvidia GTX 1650S (Super) $170Samsung 850 Evo 120GB $78
Intel Core i7-9700K $299Nvidia RTX 3080 $700Samsung 860 Evo 250GB $44
Seagate Barracuda 1TB (2016) $43Corsair Vengeance LPX DDR4 3200 C16 2x8GB $67SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $38Corsair Vengeance LPX DDR4 3000 C15 2x8GB $69SanDisk Extreme 32GB $30
Seagate Barracuda 3TB (2016) $85G.SKILL Trident Z DDR4 3200 C14 4x16GB $649SanDisk Extreme 16GB $28
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