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July 14th, 2020 09:00

XPS 9570 slow Samsung 970 Evo Plus speeds

Hey everyone

I just swapped out my skhynix SSD for a Samsung 970 Evo Plus with a clean install of windows. Had speed issues at first so I changed the SATA operation to AHCI, installed the latest Samsung drivers but the speeds remained the same. Tried other things such as re-plugging in the battery but no luck. Every relevant driver is up to date.

These are the numbers for the Samsung ssd. Sequential reads are actually SLOWER than the old ssd from dell and the rest are similar. Why cant I even get the same speeds as the skhynix?

Sequential 1MiB (Q= 8, T= 1): 883.898 MB/s
Sequential 1MiB (Q= 1, T= 1): 588.046 MB/s
Random 4KiB (Q= 32, T=16): 710.881 MB/s 
Random 4KiB (Q= 1, T= 1): 44.944 MB/s

Sequential 1MiB (Q= 8, T= 1): 851.343 MB/s 
Sequential 1MiB (Q= 1, T= 1): 597.437 MB/s
Random 4KiB (Q= 32, T=16): 501.356 MB/s 
Random 4KiB (Q= 1, T= 1): 114.710 MB/s

Anyone have any ideas what's going on and how to fix this I will be very grateful.

14K Posts

July 14th, 2020 11:00

@lminas  Does Samsung Magician confirm that you have a PCIe x4 link?  I remember a couple of cases here where people found they had a PCIe x2 link, and the fix was to simply remove and reseat the SSD.  Other than that, what are the temperature readings on the SSD?  It could be the result of thermal throttling.

5 Posts

July 14th, 2020 12:00


Thermals have always been in the 30s. Ive done tests while its hot and colder but no change.

After posting this, I noticed that I was actually only running PCI x1 in Samsung Magician (Interface section) and did what you suggest and reseat the ssd but this did not change the link x. However, sequential read/write speeds doubled to 1700 each. 

Im not sure how now im getting faster speeds with only reseating the SSD because its still saying x1 link

Anything else I should try? I think we know the problem is the x of PCIe lanes its using.

14K Posts

July 14th, 2020 13:00

@lminas  Nice!  Although I have to say the fact that this has happened a few times makes me wonder how many people have SSDs running slower than they should be without realizing it.  I'm also surprised that it's even possible for this to occur.  The position of the fastening screw at the top of the SSD doesn't seem to leave a ton of wiggle room for the SSD itself, so I wouldn't have thought that there was so much potential for a poor connection.  But I'm glad you're set!

5 Posts

July 14th, 2020 13:00

Would you imagine, I re-seated the SSD a second time and voila: PCIe x4

Sequential 1MiB (Q= 8, T= 1): 3481.934 MB/s 

Sequential 1MiB (Q= 8, T= 1): 3115.754 MB/s 

Thankyou @jphughan 

20 Posts

April 29th, 2021 00:00

After installing magician, the read was as it should. But I could not use Magician because my bios was set to RAID ON. 

I changed it and checked the drive in Magician again but it was super slow, much slower than the drive that came with dell. I upgraded the Samsung driver but it didn't change a thing. Any idea what is going on?


5 Posts

April 29th, 2021 00:00

Have you tried the solution of checking to see how many PCIe lanes you’re using?
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