2nd Sapphire HD6870 Crossfire on x4 PICe 2.0


I currently have an Asus p8z68 v-lx with i5 2400 CPU overclocked to 3.6Ghz, 8GB RAM and 1 already installed Sapphire HD6870 GPU. So the issue is that the 2nd PCIe lane bandwidth is x4 which I do found some were saying that the performance difference is not really noticeable. Is this through? Has anyone here is having the same dilemma as I am or perhaps maybe had gone through it? Appreciate a comment ;)

Will the degrade be below 5% out of the expected performance on 2 x16 PCIEs?
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  1. Quote:
    I know there is not a whole lot of difference between x4 and x8 PCI-E bandwidth however I cannot say how it would affect when in CF mode it could be a whole new story when 2 lanes are in use at the same time. http://www.youtube.com/watch?v=rSfifE2Domo&feature=relmfu

    Em.. The first lane was running on x16 not x8 in case you misunderstood the question. I'm at my office now and youtube is out of reach. lol.. will check back later at home.. thanks.
  2. I guess this article explains it all http://www.tomshardware.com/reviews/pci-express-scaling-p67-chipset-gaming-performance,2887-10.html

    Still in gaming the difference is not really noticeable and surely they will be a performance increase as well ;) So, i'd stick with my current mobo for a while n decide to get a second hd6870 ;)
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