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How much does the speed on PCIe affect SLI?

Hey! I recently upgraded my PC from AMD FX 6300 with a 970A board, to i5 4690k (clocked at 4.5Ghz) on a MSI z97-g45 gaming mobo. Right now with GTX 760, but will most likely get 970 after christmans. This mobo has following PCIe speeds:
Single PCIe 3.0 16x
Dual PCIe 3.0 x8 3.0 x8
Triple PCIe 3.0 x8 x4 x4
I am in no way considering 3 cards, though 2 would be nice at some time. I read alot about x8 x8 performing hardly worse than x16 x16, or did I mess up completely? And by how much will x8 x4 x4 bottleneck? As far as I understood it, three cards in my scenario wont be beneficial at all, or is it just the third card doing hardly anything? Thanks
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  1. Best answer
    Dual sli will work as it should. Three way will be slowed down and generally isn't s good idea, if a game doesn't support sli you lose 60% of your GPU power and its not as well supported in games that do well with sli

    I would max this with 2x 970 beyond which you will want a new motherboard or the gtx 1070 which will be out by the time you cant run the latest games
  2. Videographer said:
    Dual sli will work as it should. Three way will be slowed down and generally isn't s good idea, if a game doesn't support sli you lose 60% of your GPU power and its not as well supported in games that do well with sli

    I would max this with 2x 970 beyond which you will want a new motherboard or the gtx 1070 which will be out by the time you cant run the latest games


    That's what I thought. two 970s right now would kill it
  3. 2 - 980'Ss would kill it more.
  4. SR-71 Blackbird said:
    2 - 980'Ss would kill it more.


    It would kill my wallet ;)
  5. I agree very steep price.
  6. SR-71 Blackbird said:
    I agree very steep price.


    It very much surprised me when I saw the price on GTX 970, I think it is a beast of a deal
  7. Yes it is.
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