Average Bench: 522% (7th of 1080)

Based on 8,772 user benchmarks.  Model: WD_BLACK SN850X 4000GB

The WD Black SN850X has a superb consumer performance profile. As well as offering solid burst speeds of 5 GB/s, the SN850X also offers respectable out of cache performance. At current prices (1TB $90 USD, 2TB $145 USD and 4TB $290 USD) the WD Black SN850X is our top value pick at every capacity. [Jun '24 SSDrivePro]

Outstanding average bench

The WD Black SN850X M.2 4TB averaged 422.0% higher than the peak scores attained by the group leaders. This is an excellent result which ranks the WD Black SN850X M.2 4TB near the top of the comparison list.


Avg. 4K-64Thread Mixed IO Speed 1,548MB/s
Avg. Sequential Write Speed 3,816MB/s

Terrible consistency

The range of scores (95th - 5th percentile) for the WD Black SN850X M.2 4TB is 396%. This is a particularly wide range which indicates that the WD Black SN850X M.2 4TB performs inconsistently under varying real world conditions.


Avg. 4K Random Write Speed 189MB/s
Avg. 4K Random Read Speed 67.2MB/s

Average Bench

(Based on 8,772 samples)
Min Avg Max
2,042 Read 3,793 4,696
1,928 Write 3,816 4,940
1,799 Mixed 2,970 3,586
1,614 SusWrite 3,370 4,656
785% 3,487 MB/s
Min Avg Max
44 4K Read 67.2 84.7
60 4K Write 189 315
46.1 4K Mixed 83.5 113
309% 113 MB/s
Min Avg Max
748 DQ Read 1,787 2,486
199 DQ Write 1,382 2,073
373 DQ Mixed 1,548 2,284
1,168% 1,572 MB/s
User Benchmarks BenchSequentialRandom 4kDeep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
3TB free
Firmware: 624331WD
SusWrite @10s intervals: 4167 4179 4181 4140 4167 3397 MB/s
Read 4,272
Write 4,312
Mixed 3,358
SusWrite 4,038
900% 3,995 MB/s
4K Read 74.9
4K Write 187
4K Mixed 91.4
330% 118 MB/s
DQ Read 1,609
DQ Write 1,199
DQ Mixed 1,315
1,007% 1,374 MB/s
3.5TB free (System drive)
Firmware: 624331WD
SusWrite @10s intervals: 4029 3993 4019 4020 4014 3987 MB/s
Read 4,034
Write 4,080
Mixed 3,248
SusWrite 4,010
866% 3,843 MB/s
4K Read 58.4
4K Write 131
4K Mixed 72.1
250% 87.1 MB/s
DQ Read 2,036
DQ Write 1,499
DQ Mixed 1,696
1,287% 1,744 MB/s
3.5TB free
Firmware: 624361WD
SusWrite @10s intervals: 3818 3883 3890 3876 3879 3876 MB/s
Read 4,137
Write 4,156
Mixed 3,099
SusWrite 3,870
860% 3,815 MB/s
4K Read 55.9
4K Write 121
4K Mixed 68
236% 81.7 MB/s
DQ Read 2,143
DQ Write 1,788
DQ Mixed 1,898
1,440% 1,943 MB/s
2.5TB free (System drive)
Firmware: 624361WD
SusWrite @10s intervals: 3819 3877 4047 4073 3530 1522 MB/s
Read 3,873
Write 4274
Mixed 3,196
SusWrite 3478
836% 3,705 MB/s
4K Read 50
4K Write 213
4K Mixed 88.1
302% 117 MB/s
DQ Read 1,583
DQ Write 1,322
DQ Mixed 1,449
1,086% 1,452 MB/s
8,772 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 76,491,807 SSDs tested


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MSRP ≈ $700 @ launch in Aug '22
EbayUS $26023 mins
AmazonUS $3004 hrs
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Typical Black SN850X M.2 4TB Builds (Compare 4,304 builds) See popular component choices, score breakdowns and rankings
Gaming 453%
Desktop 125%
Workstation 596%

Motherboard: Asus ROG STRIX Z790-E GAMING WIFI

EDIT WITH CUSTOM PC BUILDER Value: 92% - Outstanding Total price: $2,544

Popular Black SN850X M.2 4TB compatible motherboards:

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Solid State Drive Rankings (Price vs Performance) July 2024 SSD Rankings

Welcome to our SSD comparison. We calculate effective speed for both SATA and NVMe drives based on real world performance then adjust by current prices per GB to yield a value for money rating. 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 SSDs. [SSDrivePro]


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.


The Ultimate X Factor...

Added 1 month ago.


7 months ago.

but Samsung 990 pro 4tb is more better


1 month ago.


15 months ago.

If you install this in a ps5 it will outrun the series x.

1080 Drives (Compared) Thousands of user benchmarks compiled into one comparison list

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

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The Best
Intel Core i5-12600K $175Nvidia RTX 4060 $293WD Black SN850X M.2 2TB $140
Intel Core i5-13600K $240Nvidia RTX 4070 $499WD Black SN850X M.2 1TB $92
Intel Core i5-12400F $110Nvidia RTX 4060-Ti $390Crucial T700 M.2 4TB $342
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