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PCIe 3.0 x16 graphics card in a PCIe 2.0 x16 slot

I'm currently debating upgrading to a GTX 970 4GB 256 bit which calls for a PCI express 3.0 x16 slot. However, I have a relatively old motherboard, an ASUS M4A77D which only has a PCI express 2.0 x16 slot.

I was curious if it was at all possible to actually get the card working without having to buy a new motherboard, and if so would I see any performance problems due to the difference in PCI slots?

Also, as a side question, I'm currently running an AMD Phenom II X4 965 processor. Would I see any significant bottle necking because of the processor?
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  1. Best answer
    It's fine. The Slots are the same, the revision number just indicates the link speed. PCI-e 2.0 is still fast enough for any card on the market.
  2. Nubnut said:
    I'm currently debating upgrading to a GTX 970 4GB 256 bit which calls for a PCI express 3.0 x16 slot. However, I have a relatively old motherboard, an ASUS M4A77D which only has a PCI express 2.0 x16 slot.

    I was curious if it was at all possible to actually get the card working without having to buy a new motherboard, and if so would I see any performance problems due to the difference in PCI slots?

    Also, as a side question, I'm currently running an AMD Phenom II X4 965 processor. Would I see any significant bottle necking because of the processor?



    Yes it's fine and with very very little difference.
    https://www.pugetsystems.com/labs/articles/Impact-of-PCI-E-Speed-on-Gaming-Performance-518/
    Impact of PCI-E Speed on Gaming Performance
  3. Yes, it will work out just perfectly. Tests were done to see the difference between 3.0 and 2.0 and the results very close. The differences were of 1 or 2 frames at most. In some cases 2.0 ran better. It will fit just fine, you do not need to worry.
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