PCI-e 3.0 GPU + MoBo + Ivy CPU = PCI-e 2.0 ???

Hello,

I have Asrock Z77 Extreme4 Mobo + i3 3220 Ivy bridge CPU. I've just added a Sapphire HD 7850 to this and I was expecting it to run @PCI-e x16 v3.0.

But GPU-z reports it's working @x16 v2.0

How can I fix that?

Reply to kenjori
16 answers Last reply
More about mobo
  1. try changing the PCI-E slot, if it worked, reset your bios.
    Reply to Simu
  2. Not that it matters.
    Reply to amuffin
  3. Simu said:
    try changing the PCI-E slot, if it worked, reset your bios.



    I tried changing slots already. No luck. Also, my other slot is a x8 one. Only the current slot is x16 v3.0 . But the card is working @x16 v2.0
    Reply to kenjori
  4. In one of BIOS updates they added:
    v2.20 9/21/2012
    1. Add Gen2 and Gen3 speed option in PCIE Link Speed setup items.
    2. Auto detects PCIE link speed.

    Maybe try changing it manually to PCIE 3.0 in BIOS.
    Reply to Bejusek
  5. amuffin said:
    Not that it matters.



    I'm aware that there shouldn't be any big difference between pci-e v2.0 and v3.0 for a single 7850. But still this might indicate another problem and I'd like to see it fixed.
    Reply to kenjori
  6. Bejusek said:
    In one of BIOS updates they added:
    v2.20 9/21/2012
    1. Add Gen2 and Gen3 speed option in PCIE Link Speed setup items.
    2. Auto detects PCIE link speed.

    Maybe try changing it manually to PCIE 3.0 in BIOS.



    Hmm I may need a BIOS update. I'll try this. Thank you :hello:
    Reply to kenjori
  7. kenjori said:
    Hmm I may need a BIOS update. I'll try this. Thank you :hello:



    BIOS update didn't change anything :(

    Any other ideas?
    Reply to kenjori
  8. Get a copy of GPU-Z and run that. PCIe allows the graphics card to clock down to a lower bus speed to save power when the highest speed is not needed. However, GPU-Z (as opposed to CPU-Z) has a graphics test that it runs in a window to force the PCIe bus speed to run at max speed.

    i.e. my system has a Radeon HD 7970 installed but when it is running on the windows desktop it only runs at PCIe x16 @ 1.0. However, when I run the GPU-Z graphics test, it steps up to PCIe X16 @ 2.0. (I don't have a PCIe 3.0 motherboard)
    Reply to JKatwyopc
  9. you could click on that small question mark in gpu-z next to the bus readout, it'll start a small render test to kick it out off power saving states. (modern cards tend to lower the interface speed as well to save power)

    edit: lol i'm so slow, but it seems i actually read the posts :P
    Reply to Kari
  10. That's right. It says PCIE 3.0x16 @x16 2.0. Mine says the same thing.
    Reply to wanderer11
  11. JKatwyopc said:
    Get a copy of GPU-Z and run that. PCIe allows the graphics card to clock down to a lower bus speed to save power when the highest speed is not needed. However, GPU-Z (as opposed to CPU-Z) has a graphics test that it runs in a window to force the PCIe bus speed to run at max speed.

    i.e. my system has a Radeon HD 7970 installed but when it is running on the windows desktop it only runs at PCIe x16 @ 1.0. However, when I run the GPU-Z graphics test, it steps up to PCIe X16 @ 2.0. (I don't have a PCIe 3.0 motherboard)


    I'm alredy running GPU-Z ??

    And it's showing @x16 1.1 when idle. It steps up to x16 v2.0 when running the render test.
    Reply to kenjori
  12. There is also another thing. When I open the Catalyst control center hardware tab. It also shows that Maximum Bus Setting is PCI Express 2.0 x16

    is this normal for 7850 ?


    Reply to kenjori
  13. Kari said:


    It seems so :pfff:

    Thank you for sorting this out :wahoo:
    Reply to kenjori
  14. Remember, ivybridge core I3 doesn't have 3.0.
    Reply to amuffin
  15. kenjori said:
    Hello,

    I have Asrock Z77 Extreme4 Mobo + i3 3220 Ivy bridge CPU. I've just added a Sapphire HD 7850 to this and I was expecting it to run @PCI-e x16 v3.0.

    But GPU-z reports it's working @x16 v2.0

    How can I fix that?



    You need to click on the question mark beside the square read GPU port speed .. and then run the test in order to ensure that the program of the speed of real GPU port have
    Reply to Abu_Hamza
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