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x16 and x8 CrossFirex

Hello, I have a MSI 970A G46. I have two 7950's and I am wondering if I am going to see much of a performance decrease when I use a combination of x16 and x8 in a CrossFire configuration. according to this video by Linus (http://www.youtube.com/watch?v=NFMzRZqFh-w) I only see a 3 point increase in X points in 3DMark Vantage. But that is a synthetic benchmark so I am wondering if I will actually see a decrease in performance when gaming. Thanks!
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  1. Best answer
    none. Technically 8x is all you need. so 2x8lanes is good.

    only Dual GPUs use full 16 lanes aka 7990

    7970 and lower use half of the bandwith so 8 lanes is all you need for a card. PCIe 2.0 at least
  2. Yes, but this is a combanation of x8 and x16.
  3. I'm running a x16 and x4 configuration in one system, and it works just fine. The bandwidth requirements of non-top tier cards is generally well below what most slots provide.
  4. bigpinkdragon286 said:
    I'm running a x16 and x4 configuration in one system, and it works just fine. The bandwidth requirements of non-top tier cards is generally well below what most slots provide.


    Nvidia drivers seem to handle that better than AMD
  5. NVIDIA may handle the situation better, but it is a pair of 7870 LE cards that I have in the x16 and x4 configuration. The performance of the cards are very near the performance of the cards which the OP was asking about.
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