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Performance drop with GTX 570 running at 8x ?

Hello,

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 (http://www.directron.com/expressguide.html).
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,
al360ex
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.
    http://www.techpowerup.com/reviews/NVIDIA/GTX_480_PCI-Express_Scaling/
    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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