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X16 card on x8 slot

i am building a serious rig with quad 7970' i need a physx card..on my asus r4e mobo there is a x16 slot working as x8...usually gpu's are will a x16 card work on x8(x16 slot working as x8 pcie 2.0/3.0) slot?
and i also need recommendation on the physx card...plz help
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  1. U can run x16/x8/x8/x8.

    U have .

    1= x16

    2= x16/x16

    3= x16/x8/x16

    4= x16/x8/x8/x8

    4 x PCIe 3.0/2.0 x16 (x16; x16/x16; x16/x8/x16 and x16/x8/x8/x8, red) *1

    *1-2 For PCIe 3.0 x16 (X8 mode), PCIEx8_2B(Grey) shares bandwidth with PCIEx8_2A(Red).
  2. It will work fine.

    And u will not even know about that,

    because the performance loss would be just a few FPS.
  3. In reality, 32 PCIe lanes (GPU-z reads it wrong if in 4-WAY you see x16 on GPU_1) and they're actually running x8/x8/x8/x8 PCIe 3.0 assuming you have: 1. BIOS version that Enables the PCIe 3.0, 2. HD 7000 series, 3. GTX 600 series AND run this ->
  4. well,am gonna use the card ONLY for physx..would i still have less fps?
  5. Best answer
    ^Then it doesn't matter (PhysX).
  6. You can't use a separate card for PhysX. Firmware starting from the HD 4000 series prevents this from working. You won't need it with that much horsepower, anyway.
  7. You can use it as a PhysX just not in CF + PhysX. There are (hacked) drivers that allow it but last I looked aren't kept up to date (old).
  8. Best answer selected by mukitbinazad.
  9. This topic has been closed by Nikorr
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