Performance drop with GTX 570 running at 8x ?


I was wondering, if I were to put 3 GTX 570s in the Rampage III formula, the PCIe 2.0 bandwidth would drop to 8x on all lanes.
From what I've read, that means a bandwidth 8000MB/s per slot (
The thing is, what is the bandwidth these cards are capable of, and would I see a bottleneck in terms of speed (between the lane and the mobo), compared to a single GTX 570 that would run at 16000MB/s (16x) ?

Would I absolutly need a motherboard that has 2 NF200 chips (like the EVGA Classified 4-way SLI) in order to utilise the full potential of these cards ?
I think that in theory, the answer is yes, but in practice, does it make a diffrence in games and in benchmarks if the cards are running at 8x or 16x ?
And is it worth it (ratio performance update vs price), because these chips are really expensive, thus making the motherboard very expensive ?

Thank you for your answers,
4 answers Last reply Best Answer
More about performance drop running
  1. 8X is absolutely fine, as you loose about 2-5% of FPS performance compared to X16
  2. HansVonOhain said:
    8X is absolutely fine, as you loose about 2-5% of FPS performance compared to X16

    Why is the performance drop so small ? Is it because the hardware is not yet able to saturate a PCIe 2.0 16x lane ? But then, what would be the point of PCIe 3.0 ?
  3. Best answer
    Were a long way from saturating the PCIE 2.0 bandwidth for video cards. Check out the PCIE scaling article.
    The up and coming PCIE 3.0 is useless at this point in time IMO. Unless your using a OCZ RevoDrive ssd. or some other SSD that takes a PCIE slot.
  4. Best answer selected by al360ex.
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