CorsairCMK16GX4M4A2666C16(|B|R)
HyperXHX421C14FB(|2)K2/16
Real World Speed
Performance profile from 8,897 user samples
830 User Benchmarks
Best Bench: 110% @ 2667 MHz
Worst Bench: 69% @ 2667 MHz
Poor: 69% Great: 110%
SPEED RANK: 17th / 70
8,067 User Benchmarks
Best Bench: 81% @ 3000 MHz
Worst Bench: 42% @ 2133 MHz
Poor: 42% Great: 81%
SPEED RANK: 39th / 70
Effective Speed
Effective RAM Speed
92.1 % Faster effective speed.
+26%
72.9 % -26%
MC Read
Avg. 16 Core Read Bench
35 GB/s Much faster multi-core read.
+33%
26.4 GB/s -33%
MC Write
Avg. 16 Core Write Bench
36.6 GB/s Much faster multi-core write.
+33%
27.6 GB/s -33%
MC Mixed
Avg. 16 Core Mixed IO Bench
31.7 GB/s Much faster multi-core mixed.
+35%
23.4 GB/s -35%
MC Read
16 Core Read Bench
43 GB/s Much faster multi-core read.
+46%
29.5 GB/s -46%
MC Write
16 Core Write Bench
47.8 GB/s Much faster multi-core write.
+58%
30.2 GB/s -58%
MC Mixed
16 Core Mixed IO Bench
39.9 GB/s Much faster multi-core mixed.
+51%
26.4 GB/s -51%
Market Share
Based on 2,957,725 RAM Kits tested.
Market Share
Market Share (trailing 30 days)
0.1 % -400% 0.5 % Hugely higher market share.
+400%
Value
Value For Money
54.1 % +3% 52.7 % -3%
User Rating
UBM User Rating
52 % -23% 64 % More popular.
+23%
Price
Price (score)
$125 -9% $114 Slightly cheaper.
+9%
Age
Newest
31 Months -16% 26 Months More recent.
+16%
SC Read
Avg. 1 Core Read Bench
16 GB/s -2% 16.4 GB/s +2%
SC Write
Avg. 1 Core Write Bench
24.5 GB/s -10% 26.9 GB/s Slightly faster single-core write.
+10%
SC Mixed
Avg. 1 Core Mixed IO Bench
22 GB/s -1% 22.2 GB/s +1%
SC Read
1 Core Read Bench
20.9 GB/s Slightly faster single-core read.
+8%
19.4 GB/s -8%
SC Write
1 Core Write Bench
37.5 GB/s Faster single-core write.
+20%
31.3 GB/s -20%
SC Mixed
1 Core Mixed IO Bench
28.7 GB/s Slightly faster single-core mixed.
+10%
26 GB/s -10%
Latency
Avg. Physical RAM Latency
65 ns Slightly lower access latency.
+6%
68.9 ns -6%
Latency
Physical RAM Latency
55.9 ns Slightly lower access latency.
+7%
60 ns -7%
Capacity
Capacity
16GB 16GB
Memory Kit Rankings (Price vs Performance) April 2017 RAM Rankings.

Welcome to our DDR4 Memory Kit comparison. We calculate effective RAM speed which measures performance for typical desktop users. Effective speed is adjusted by cost per GB to yield value for money. Calculated values don't always tell the whole picture so we check them against thousands of individual user ratings. The customizable table below combines these factors and more to bring you the definitive list of top Memory Kits. Share your opinion by voting. [RAMPro]

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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 (UBM).
  • - CPU tests include: integer, floating and string.
  • - GPU tests include: six 3D game simulations.
  • - Drive tests include: read, write and mixed IO.
  • - Checks include: 4k Align, NCQ, TRIM, SATA, USB & S.M.A.R.T.
  • - 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 highest voted in class.
  • - Find the best upgrades.
  • - Share your opinion by voting.

 Frequently Asked Questions

 Best User Rated

The Best.
CPUGPUSSD
Intel Core i7-7700K $300Nvidia GTX 1070 $330Samsung 850 Evo 250GB $100
Intel Core i5-7600K $229AMD RX 480 $238Samsung 850 Pro 256GB $146
Intel Pentium G4560 $60Nvidia GTX 1060-6GB $219Samsung 850 Evo 500GB $170
HDDRAMUSB
Seagate Barracuda 1TB (2016) $50Corsair Vengeance LPX DDR4 3000 C15 2x8GB $127SanDisk Extreme 64GB $33
Seagate Barracuda 3TB (2016) $90G.SKILL Trident Z DDR4 3200 C14 4x16GB $700SanDisk Extreme 32GB $22
Seagate Barracuda 7200.14 1TB $46HyperX Fury DDR4 2133 C14 2x8GB $114SanDisk Ultra Fit 32GB $13
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