TEST: Lexar NM790 2TB M.2 SSD

Technical data
Image
Manufacturer	Lexar
Model number	LNM790X002T-RNNNG
Storage capacity	2048 GB (1908 GiB)
pSLC-Cache	195 GB approx.
Read speed	7400 MB/s
Write speed	6500 MB/s
Interface	PCIe 4.0 x4
Connection	M.2 2280
Memory module (NAND)	TLC
DRAM Cache	no
TBW (Total Bytes Written)	1500 Terabyte
Controller	Maxio MAP1602
Price	ca. 149 USD (= 0,07 $ / GB)
Paid link	Buy on Amazon

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Compared to the top performer*

Read speed

99 %

Write speed

95 %

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

This SSD is PS5 compatible. It can be used as expansion storage in a PlayStation 5 console.

AS SSD Benchmark

Standard performance test

The standard test was performed using a 5 GB file. A total score of 6943 points was achieved.

AS SSD	Read:	Write:
Seq in megabytes per second	6171,60 MB/s	5790,00 MB/s
4K in megabytes per second	69,03 MB/s	173,51 MB/s
4K-64Thrd in megabytes per second	2468,28 MB/s	1443,81 MB/s
Access time in milliseconds	0,022 ms	0,265 ms
Score	3154	2196
Total score	6943

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 August 28, 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	2098,44 MB/s	1,10 s
Program many small files	1136,63 MB/s	6,19 s
Game small and large files	1947,78 MB/s	3,55 s

Compression Performance Test

This measures the write and read speed of the the Lexar SSDSSD is measured depending on the compressibility of the data (according to the manufacturer, these should be 7400MB/s and 6500MB/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	7436,02	6695,31
SEQ1M Q1T1	5115,66	5549,82
RND4K Q32T16	3475,82	2198,97
RND4K Q1T1	77,56	178,29

HD Tune Pro Endurance test

This is a long term test to make full use of the memory capacity. You can see when a cache is full and the writing performance decreases. A test file of 300 GB was written to the medium. After approx. 195 GB, the pSLC-Cache was full and the performance was throttled.
At least the test file could be read with an average write speed of 5513 MB/s and written with 3688 MB/s.

HD Tune Pro Benchmark

HD Tune writes a 5 GB file to the Lexar M.2 SSD. The transfer data of the read speed is displayed graphically. The minimum, maximum and average values are also determined. The determined access time and burst rate are also displayed.

ATTO Disk Benchmark

Here, a 256 MB file is written several times to the Lexar M.2 SSD . The I/O block size varies (from 512 bytes to 64 megabytes). The larger the blocks, the faster they can be written and read.

SSD-Z Benchmark

Similar to HD Tune, a 500 MB file is written to the Lexar M.2 SSD here. is written. The transfer data is displayed. The more constant the line, the better. Unfortunately the tool does not work correctly above about 5,000 MB/s and no line (and sometimes wrong min and max data) is displayed.

The benchmark test was performed on August 28, 2023.
Information about the test system can be found at the bottom of the home page.
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