Question Samsung 870 QVO 1TB slow write speeds

[troller100]

UPDATE 3: Solved? seems like the 870 QVO sucks and there's nothing you can do about it, the write speeds will be limited to 80MB/s after the cache gets filled.

I was noticing the extracting speed when using WinRAR was very slow, and decided to benchmark my SSD again to see if it's because of that or winrar just being slow, and the write speeds were around 80mb/s on CrystalDiskMark, but Samsung Magician shows 510mb/s for some reason.

When I first installed the ssd it was working as expected, around 500mb/s read and around 500mb/s write, but now it's just slow, without me changing anything.
The drive letter is C: on the ssd and i'm using my windows on it as well.

UPDATE:
After doing 2 more tests with Samsung Magician, it now shows 86/87mb/s write speeds, I really have no idea what is going on.

UPDATE 2:
When starting a CrystalDiskMark benchmark the write speeds will go over 500MB/s(like expected), and then go back to around 80MB/s. This happens once in the start of the video and at 0:39

View: https://www.youtube.com/watch?v=iNkJ8yv8t34


If someone knows why this is caused and if it has to do something with my slow speeds please let me know!

 

[USAFRet]

as a question, doesn't this mean this happens to all ssd's?

No.
The 870 EVO, for instance, does not have this issue.

The QVO is a special case.

 

[COLGeek]

TH actually reviewed this model (note the second "con" and the write-up regarding write performance):

Samsung 870 QVO SATA SSD Review: Taking Baby Steps With QLC (Updated)

New hardware brings higher capacity, but minuscule performance gains

www.tomshardware.com

 

[zx128k]

TH actually reviewed this model (note the second "con" and the write-up regarding write performance):

Samsung 870 QVO SATA SSD Review: Taking Baby Steps With QLC (Updated)

New hardware brings higher capacity, but minuscule performance gains

www.tomshardware.com

Intelligent TurboWrite is much better on the 2TB and 4TB versions, 160MB/s and not 80MB/s. 160MB/s is a lot less painful.

For the 1TB 870 QVO, the Intelligent TurboWrite cache measures up to 42GB, while the higher-capacity models have up to 78GB of cache.

This image really makes the issue easy to see. After TurboWrite basically sucks.

 

[COLGeek]

So the key take away is a design limitation has been confirmed by the OP. Really no "fix" for that.

I learned something new today (not so new, but new for me).

 

[troller100]

So the key take away is a design limitation has been confirmed by the OP. Really no "fix" for that.

I learned something new today (not so new, but new for me).

Yup, thanks to everyone who helped me on this thread, I really appreciate it!