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Crossfire on an x16 PCIE 3.0 and x4 PCIE 2.0?

I am planning to get a R9 280X. If I were to crossfire them in the future, would it be bottlenecked significantly? My motherboard is an Asrock H77 Pro4/MVP
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  1. Best answer
    here is your manual
    http://www.asrock.com/mb/Intel/H77%20Pro4MVP/?cat=Manual

    one of the beta drivers a couple of months ago from AMD made my second pcie3.0 16x (or 8 x 8 when in crossfire) run at 4x and it severely hurt performance.

    I am running two 7950's for reference
  2. 2.0 and X4? That sounds like a bottle neck for anything more than a budget entry-level card.
  3. fkr said:
    here is your manual
    http://www.asrock.com/mb/Intel/H77%20Pro4MVP/?cat=Manual

    one of the beta drivers a couple of months ago from AMD made my second pcie3.0 16x (or 8 x 8 when in crossfire) run at 4x and it severely hurt performance.

    I am running two 7950's for reference


    So your motherboard runs at PCIE 3.0 x8/x8?
  4. Bickering Whale said:
    So your motherboard runs at PCIE 3.0 x8/x8?

    PCI-Express 3.0 means nothing. Cards currently only use PCI-Express 2.0 at x8 speed which is why two cards at PCI-Express 2.0 x8/x8 do not suffer a performance penalty. PCI-Express 3.0 at x8/x8 is the same as PCI-Express 2.0 at x16/x16 which was done long ago on the old AMD 790FX chipset, the Intel X58 chipset and one of the nForce chipsets. PCI-Express 3.0 x8/x8 has the same speed as that old standard. Intel and nVidia just market it like it's the next big thing, which it isn't, at least not yet. It will be years before video cards are able to leverage that much bandwidth.
  5. Gen2 4x will bottleneck a graphics card.
  6. listen to the manofchalk as he is correct. gen 2 4x will absolutely not let a current gen card run at its max and it will even degrade the performance of the first GPU
  7. fkr said:
    listen to the manofchalk as he is correct. gen 2 4x will absolutely not let a current gen card run at its max and it will even degrade the performance of the first GPU


    So it would be better to just use a single faster GPU rather than looking at crossfire as a future upgrade path? Damn I bought a shit motherboard.
  8. using a single powerful GPU is definitely the best way to go in your scenario. If you watch the deals carefully to can keep upgrading a single GPU on a fairly regular basis. I waited months and the msi twin frzr 7950 went down to $205. that means that I will be able to sell that for $170+ pretty easily as soon as the current GPU prices stabilize.
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