TEST: Silicon Power UD85 1TB M.2 SSD

Technical data
Image
Manufacturer	Silicon Power
Model number	SP01KGBP44UD8505
Storage capacity	1024 GB (954 GiB)
pSLC-Cache	256 GB approx.
Read speed	3600 MB/s
Write speed	2800 MB/s
Interface	PCIe 4.0 x4
Connection	M.2 2280
Memory module (NAND)	QLC
DRAM Cache	no
TBW (Total Bytes Written)	600 Terabyte
Controller	Realtek RL6817
Price	ca. 163 USD (= 0,16 $ / GB)
Paid link	Buy on Amazon

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Compared to the top performer*

Read speed

64 %

Write speed

42 %

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

AS SSD Benchmark

Standard performance test

The standard test was performed using a 5 GB file. A total score of 4195 points was achieved.

AS SSD	Read:	Write:
Seq in megabytes per second	4206,27 MB/s	2740,34 MB/s
4K in megabytes per second	63,70 MB/s	160,67 MB/s
4K-64Thrd in megabytes per second	874,26 MB/s	1764,16 MB/s
Access time in milliseconds	0,024 ms	0,124 ms
Score	1359	2199
Total score	4195

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 January 09, 2024 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	1942,13 MB/s	1,18 s
Program many small files	1218,01 MB/s	5,78 s
Game small and large files	1996,55 MB/s	3,46 s

Compression Performance Test

This measures the write and read speed of the the Silicon Power SSDSSD is measured depending on the compressibility of the data (according to the manufacturer, these should be 3600MB/s and 2800MB/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	4778,73	2913,69
SEQ1M Q1T1	3872,45	2919,07
RND4K Q32T16	960,23	2004,32
RND4K Q1T1	71,62	176,76

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. 256 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 2875 MB/s and written with 706 MB/s.

HD Tune Pro Benchmark

HD Tune writes a 5 GB file to the Silicon Power 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 Silicon Power 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 Silicon Power M.2 SSD here. The transfer data is displayed. The more constant the line, the better.

The benchmark test was performed on January 09, 2024.
Information about the test system can be found at the bottom of the home page.
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