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pci-e 3.0 x16 unning at pci-e 2.0 x8?

hi first time poster but a regular reader of the site :-)
im wondering if someone can tell why in gpu-z it says my gpu is running pci-e 3.0 x8 @ x8 1.1 idle and when in use its pci-e 3.0 x8 @ x8 2.0 .
my motherboard is pci-e 3.0 and also my graphics card so shouldnt it be running at 3.0 x16?
ive taken screen shots of gpu-z so you can see what i see.
any ifomation would be welcomed :-)

first picture is idle 2nd picture is with render test






my system....

amd x4 750k cpu
gigabyte r7 240 oc 2gb ddr3 pci-e 3.0 x16
4gb corsair xms3 1600mhz
gigabyte GA-F2A88XM-DS2 (rev. 3.0) motherboard pci-e 3.0 x16
corsair vs650 650w
16 answers Last reply Best Answer
More about pci x16 unning pci
  1. you should be able to set the pci-e lane count in bios.
  2. HEXiT said:
    you should be able to set the pci-e lane count in bios.


    hi thanks for the post!
    ive looked in bios and theres nothing except turn the pci-e as first output
  3. some gigabyte boards have an advanced menu that you can open with ctrl f3 when in bios. i dunno if yours does but its worth a try.
  4. HEXiT said:
    some gigabyte boards have an advanced menu that you can open with ctrl f3 when in bios. i dunno if yours does but its worth a try.


    il give it a go now
  5. just tried it and nothing :-(
    but i did have an option for pci-e .... auto, gen 1 , gen2
  6. choosing gen 1 or gen 2 can help with compatibility issues.
  7. goingincircles said:
    just tried it and nothing :-(
    but i did have an option for pci-e .... auto, gen 1 , gen2


    FM2+ processor is needed for pcie 3.0

    Having said that, the slot should be running at 2.0 x16 with that processor.


    Make sure you have the mobo drivers/bios up to date.
  8. HEXiT said:
    choosing gen 1 or gen 2 can help with compatibility issues.


    ive tried auto, gen 1 and 2 and still the same!!
    ive read online last night it could be my cpu? Its not compatible with pci-3.0!! Or something lol. Which confused me coz if it only run at pci-e 2.0 then why am i only running 2.0x 8 shouldnt it be 2.0 x16?
  9. maxalge said:
    goingincircles said:
    just tried it and nothing :-(
    but i did have an option for pci-e .... auto, gen 1 , gen2


    FM2+ processor is needed for pcie 3.0

    Having said that, the slot should be running at 2.0 x16 with that processor.


    Make sure you have the mobo drivers/bios up to date.

    hi maxalge hanks for the post. all my drivers are uptodat and my bios is too, ta all new parts so shouldnt be faulty but something is wrong somewhere coz like you said it should still go 2.0 x16

  10. ive just also noticed if you look on the pictures my gpu memory is 800mhz but the specs of the card insist its 1600mhz!! would the gpu need a bios update of somekind? ive updated the bios on the mobo but i havent a clue about gpu`s
  11. Don't worry, that's the base memory frequency.
    My Gainward GTX650 shows that frequency as 1249.7 MHz, whereas it's a GDDR5 card that shows 2499 MHz in games and runs at 5000 MHz(because of GDDR5). A DDR3 card will show 1249 and run at 2499.
  12. cst1992 said:
    Don't worry, that's the base memory frequency.
    My Gainward GTX650 shows that frequency as 1249.7 MHz, whereas it's a GDDR5 card that shows 2499 MHz in games and runs at 5000 MHz(because of GDDR5). A DDR3 card will show 1249 and run at 2499.


    hi cst1992 thanks for clearing that bit up! would you have any idea what my other problem is?
    ive just read it could be my usb 3 ports taking lane bandwidth making my pci-e slot run x8?
  13. goingincircles said:
    ive just also noticed if you look on the pictures my gpu memory is 800mhz but the specs of the card insist its 1600mhz!! would the gpu need a bios update of somekind? ive updated the bios on the mobo but i havent a clue about gpu`s



    It should be 900mhz core, 900mhz memory I think... Are you using a program like afterburner?
  14. maxalge said:
    goingincircles said:
    ive just also noticed if you look on the pictures my gpu memory is 800mhz but the specs of the card insist its 1600mhz!! would the gpu need a bios update of somekind? ive updated the bios on the mobo but i havent a clue about gpu`s



    It should be 900mhz core, 900mhz memory I think... Are you using a program like afterburner?


    im using gpu-z and it shows gpu clock 900mhz and memory 800mhz
  15. Best answer
    goingincircles said:


    hi cst1992 thanks for clearing that bit up! would you have any idea what my other problem is?
    ive just read it could be my usb 3 ports taking lane bandwidth making my pci-e slot run x8?


    That can't be.
    Unless, you have a PCI-E USB3 card attached with a fast hard drive that's transferring data at the same time, but it goes only upto around 100MB/s realistically for a hard drive, and for a SSD, it's max. 5Gbps(625MB/s).
    Even assuming you have a PCI-E USB3 card, it's only upto x4, and doesn't take enough bandwidth to slow down your graphics card considerably. A PCI-E 3.0 x8 slot will have around 8 GB/s of bandwidth(64 Gbps; very high compared to even full USB3).
    Your card seems to be the one of the low-profile versions of the R7 240 or 250, which are PCI-E 3.0 x8 cards at 800 MHz memory clock.
    Your card is running normally. Nothing to worry about.
  16. cst1992 said:
    goingincircles said:


    hi cst1992 thanks for clearing that bit up! would you have any idea what my other problem is?
    ive just read it could be my usb 3 ports taking lane bandwidth making my pci-e slot run x8?


    That can't be.
    Unless, you have a PCI-E USB3 card attached with a fast hard drive that's transferring data at the same time, but it goes only upto around 100MB/s realistically for a hard drive, and for a SSD, it's max. 5Gbps(625MB/s).
    Even assuming you have a PCI-E USB3 card, it's only upto x4, and doesn't take enough bandwidth to slow down your graphics card considerably. A PCI-E 3.0 x8 slot will have around 8 GB/s of bandwidth(64 Gbps; very high compared to even full USB3).
    Your card seems to be the one of the low-profile versions of the R7 240 or 250, which are PCI-E 3.0 x8 cards at 800 MHz memory clock.
    Your card is running normally. Nothing to worry about.



    its completley baffled me lol, im not to worried really i was more curious than anything, i did a windows rating test thing and the cpu scored 7.3 and gpu 6.8.
    im not a gamer its my personal comp for watching tv and movies so im happy with how its performing so far.
    its not a massive card but its not the lp version rev 2.0
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