[SOLVED] SSD transfer speeds plummet to 5MB/s

[pilky140]

Hi all, I'm having a bit of an issue with the read/write speeds on my SSD's.

I'm currently copying a large file (~170gb) from my 970 EVO Plus M.2 to my Crucial BX500 sata SSD. As you can see in the attached image this happens at around 5MB/s.

At the start of the transfer it boasts 300/400MB/s then quickly drops to around 5MB/s, now I'd assume that's just buffering.

I have checked the drives for errors using HDTune Pro which reports both drives are perfectly fine. I believe both firnmwares are up to date and the 970EVO uses Samsung NVMe Controller.

Could anyone reccomend something to try? I would expect to see speeds of around 300-400MB/s.

Ryzen 5 3600
5700 XT
MSI X570 MPG
Crucial BX500 960gb (sata)
Samsung 970 EVO Plus (M.2)

Thanks in advance.

https://imgur.com/a/wTiYK8T

 

[USAFRet]

Once the cache space of the target drive fills up....it WILL slow down to a crawl.

The BX500, being DRAMless....that happens fairly quickly.
https://www.tomshardware.com/reviews/crucial-bx500-ssd,5377.html

 

[pilky140]

Yeah I get that, but does the 4-7MB/s speeds seem normal even at the crawl?

 

[USAFRet]

Yeah I get that, but does the 4-7MB/s speeds seem normal even at the crawl?

Yes.
It slows right down to HDD performance.

 

[pilky140]

Yes.
It slows right down to HDD performance.

I see, well thanks for your replies I guess I'll have to deal with that, luckily I rarely have to move large files like this one.

 

[Maxxify]

It definitely slows down a lot outside of the SLC cache although the cache is quite large, not sure I'd expect it to get THAT slow but it's possible if the controller is overwhelmed with background management as well.