PCIe x16 running at x8 instead ? whats the solution!

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wmodrate

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Jan 27, 2018
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Hey everyone.
So i recently got my new gtx 1070 hall of fame, and i tried it on my brother's pc before i try it on mine. it ran at PCIe 3.0 x16 and everything was fine. Now on my MSI B250M gaming pro, its always running at PCIe 3.0 x8, even at load so its definitely not power saving issue, i just updated my bios to the latest version and its still PCIe 3.0 x8. I honestly do not notice any difference in performance the card so far is capable of everything it should be capable of. Does it somehow affect my performance? what possibly could be the issue? thanks.

https://imgur.com/sLvtEH2

https://imgur.com/3mxRwSP
 
Solution
Only thing I can think of would be something taking up at least one of the PCI Express lanes, which is causing your PCI-Ex16 slot to run at less than x16 (next available is x8). However, I don't see anything that might be causing that.

Other than suggesting moving your SATA drive to different locations, I really don't have any other ideas.

-Wolf sends
What is the full configuration of your system?

In particular:
1) What processor is installed?
2) Are any PCI-Ex1 expansion cards installed?
3) Are you using any M.2 cards?
4) How many SATA ports are in use and which ones?
5) Which operating system are you using?

-Wolf sends
 
Only thing I can think of would be something taking up at least one of the PCI Express lanes, which is causing your PCI-Ex16 slot to run at less than x16 (next available is x8). However, I don't see anything that might be causing that.

Other than suggesting moving your SATA drive to different locations, I really don't have any other ideas.

-Wolf sends
 
Solution
Could be, but as stated earlier, it's not going to affect performance. It might also be a faulty reading. Personally, I'd just wait to hear back from MSI and see what they say. If there's an easy fix, great! If it requires an RMA, then I'd have to decide if it's worth the time.

-Wolf sends
 


The motherboard only has one PCI-Ex16 slot and it's supposed to be rated at PCIE 3.0 x16.

-Wolf sends
 
@wolfshadw I just fixed it :) your idea of removing SATA inspired me of removing other parts, so i disconnected everything and started by CPU once i reconnected it the GPU is now X16! so i guess removing and placing CPU fixed it for me
 


Shouldn't have, but OK! I still think it's a fault with the reporting software, but as long as you're happy, so am I.

Just to make sure, I'd reboot one more time and check it again to make sure it still reads x16.

-Wolf sends
 
I did and its still x16 :) I think it has something to do with CPU lanes.. they keep some information so I guess reconnecting it removed some of the false data... or so I've been told ^^
 
I had the same question with a Gigabyte P67X motherboard and a GTX 1060. With GPU-Z I saw the card was running at PCIe 2.0 8x. Reading the board's Overview in Gigabyte's site, there were a plus called "Turbo USB 3.0" that in case of enabling it, it would take 8x PCIe lanes. I disabled this setting and GPU-Z now showed the 16x parameter.
 
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