I bought this disk in 2tb and it performs really bad. Read write speeds are half as advertised. Did I get a faulty unit or Adata and Digitec are mirespresenting the performance. All tests I watched before I bought it showed around 3000 mb/s read write speeds. I get maximum 2000 reads and 1500 writes.

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Accepted Answer

Hi I have the same Adata Flash SX8200 Pro, 2TB, M.2.228 and following your question did some speed tests on my drive using CrystalDiskMark V8.0.0. 

These are the results:

Settings were for 5 passes and 1GiB

Test                Read (MB/s)        Write (MB/s)

SEQ1M            2950.16               2726.49
Q8T1

SEQ1M           2667.92               2473.37
Q1T1

RND4K             455.84                  294.37
Q32T1 

RND4K                55.23                158.70
Q1T1

Answer

Mine didn't work out of the factory. I had to replace it with a new one.
Many users had this problem as you can see here: https://forums.tomshardware.com/threads/adata-sx8200-slow-write-speed.3466375/
I think in the end you'll have to swap it too. Some of the people on that forum were lucky enough to get a replacement.

Answer

I just performed the test as well.   I have two of these (Adata SSD Adata Flash SX8200 Pro, 2TB, M.2.2280) in my system which I also bought from Digitec.  

One is my OS drive (Windows 10), the second is a data drive.

CrystalDiskMark v6.0.2 x64
5x passes, 1GiB.  

OS  drive (22% used capacity):  Seq Q32T1 Read = 2584.0,  Write = 2436
Data drive (30% used capacity):  Seq Q32T1 Read = 3455,  Write = 2634

Hope this helps.

Good luck.

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Question about Adata SX8200 Pro