TEST: Western Digital WD_BLACK SN770 250GB M.2 SSD

Technical data
Image
Manufacturer	Western Digital
Model number	WDS250G3X0E
Storage capacity	250 GB (233 GiB)
pSLC-Cache	86 GB approx.
Read speed	4000 MB/s
Write speed	2000 MB/s
Interface	PCIe 4.0 x4
Connection	M.2 2280
Memory module (NAND)	TLC
DRAM Cache	no
TBW (Total Bytes Written)	200 Terabyte
Controller	WD 20-82-10081-A1
Price	ca. 46 AUD (= 0,18 $ / GB)
Paid link	Buy on Amazon

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Compared to the top performer*

Read speed

63 %

Write speed

75 %

*) Test result evaluated according to AS SSD Score within the same size.

AS SSD Benchmark

Standard performance test

The standard test was performed with a 5 GB file. A total score of 3676 points was achieved.

AS SSD	Read:	Write:
Seq in megabytes per second	3498,31 MB/s	1933,11 MB/s
4K in megabytes per second	72,25 MB/s	190,37 MB/s
4K-64Thrd in megabytes per second	890,13 MB/s	1366,47 MB/s
Access time in milliseconds	0,019 ms	0,122 ms
Score	1312	1750
Total score	3676

Copy Performance Test

A common everyday situation is simulated here. Three test folders are created:

• ISO (folder with two large files)
• Program (folder with many small files)
• Game (folder with small and large files)

The three folders are copied using the Windows Copy command (the cache remains enabled). The practical test of April 19, 2023 shows the performance for simultaneous write and read operations. The lower the duration, the better the performance.

AS SSD Copy-Benchmark	Transfer rate:	Duration:
ISO two large files	2127,53 MB/s	1,08 s
Program many small files	1149,15 MB/s	6,13 s
Game small and large files	1907,04 MB/s	3,62 s

Compression Performance Test

Here, the writing and reading speed of the the Western Digital SSDSSD is measured depending on the compressibility of the data (according to the manufacturer, these should be 4000MB/s and 2000MB/s respectively).

CrystalDiskMark Benchmark

Here, two sequential and two random performance tests are performed, similar to the ones performed on the AS SSD.

CDM	Read [MB/s]	Write [MB/s]
SEQ1M Q8T1	4057,01	2019,68
SEQ1M Q1T1	2925,81	2024,19
RND4K Q32T16	741,64	1739,82
RND4K Q1T1	65,56	222,95