Hello guys, I think I've finally solved the problem. I tried the parameters oc I have indicated in some previous post cards and PCI-E are not recognized all of them. This problem occurs with 3 Extreme4, my 2600k and not dependent on the pci-e card (ex: on my Extreme4 the avermedia is not recognized, on a second extreme 4 network adapter pci-e etcetc) ...
Then I thought of raising a step voltage of the pch, vtt and cpu ppl voltage and now all the problems seem to have disappeared. I could not figure out which of the 3 parameters serve up, so I got up all 3, does anyone know tell me which parameter is used to give "stability" under the lines oc pci-e?

Thank you and we hope that the board will continue to work beautifully as now