CorsairCMK16GX4M4A2666C16(|B|R)
HyperXHX421C14FB(|2)K2/16
Real World Speed
Performance profile from 13,462 user samples
1,067 User Benchmarks
Best Bench: 112% @ 1333 MHz
Worst Bench: 68% @ 2133 MHz
Poor: 68% Great: 112%
SPEED RANK: 18th / 70
12,395 User Benchmarks
Best Bench: 82% @ 1600 MHz
Worst Bench: 42% @ 800 MHz
Poor: 42% Great: 82%
SPEED RANK: 42nd / 70
Effective Speed
Effective RAM Speed
90.4 % Faster effective speed.
+25%
72.1 % -25%
MC Read
Avg. 16 Core Read Bench
34.4 GB/s Much faster multi-core read.
+31%
26.3 GB/s -31%
MC Write
Avg. 16 Core Write Bench
35.5 GB/s Much faster multi-core write.
+31%
27.1 GB/s -31%
MC Mixed
Avg. 16 Core Mixed IO Bench
31 GB/s Much faster multi-core mixed.
+33%
23.3 GB/s -33%
MC Read
16 Core Read Bench
43.4 GB/s Much faster multi-core read.
+45%
29.9 GB/s -45%
MC Write
16 Core Write Bench
48.3 GB/s Much faster multi-core write.
+57%
30.8 GB/s -57%
MC Mixed
16 Core Mixed IO Bench
40.4 GB/s Much faster multi-core mixed.
+51%
26.7 GB/s -51%
Market Share
Based on 4,904,164 RAM Kits tested.
Market Share
Market Share (trailing 30 days)
0.05 % -700% 0.4 % Hugely higher market share.
+700%
Value
Value For Money
44.4 % Better value.
+17%
38.1 % -17%
User Rating
UBM User Rating
53 % -21% 64 % More popular.
+21%
Price
Price (score)
$151 +4% $157 -4%
Age
Newest
37 Months -14% 32 Months Slightly more recent.
+14%
SC Read
Avg. 1 Core Read Bench
16.3 GB/s 0% 16.3 GB/s 0%
SC Write
Avg. 1 Core Write Bench
25.2 GB/s -4% 26.3 GB/s +4%
SC Mixed
Avg. 1 Core Mixed IO Bench
22.4 GB/s +3% 21.8 GB/s -3%
SC Read
1 Core Read Bench
21.1 GB/s Slightly faster single-core read.
+6%
19.9 GB/s -6%
SC Write
1 Core Write Bench
37.7 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.
+8%
26.5 GB/s -8%
Latency
Avg. Physical RAM Latency
67.2 ns Slightly lower access latency.
+5%
71 ns -5%
Latency
Physical RAM Latency
55.9 ns Slightly lower access latency.
+7%
60.2 ns -7%
Capacity
Capacity
16GB 16GB
Memory Kit Rankings (Price vs Performance) October 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]

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 $394Samsung 850 Evo 250GB $95
AMD Ryzen 7 1700 $280AMD RX 480 $491Samsung 850 Pro 256GB $128
Intel Core i5-7600K $230Nvidia GTX 1060-6GB $260Samsung 850 Evo 500GB $150
HDDRAMUSB
Seagate Barracuda 1TB (2016) $45G.SKILL Trident Z DDR4 3200 C14 4x16GB $950SanDisk Extreme 64GB $33
Seagate Barracuda 3TB (2016) $75Corsair Vengeance LPX DDR4 3000 C15 2x8GB $160SanDisk Extreme 32GB $22
Seagate Barracuda 2TB (2016) $60Corsair Vengeance LPX DDR4 3200 C16 2x8GB $180SanDisk Ultra Fit 32GB $13
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