Ok so I have to GTX 470 SLI in the first two PCI-E 3.0 Slots of my P9X79 WS Board that does support sli (up to quad sli in fact!) and on some boot ups I get SLI to work, it shows up in device manager and in nvidia control panel. Then on some boots, about 70 percent of the time, I boot up (after changing completely nothing) and it doesn't work! Nothing shows up in NVIDIA Control Panel or in Device manager (well in device manager of course one card comes up). I don't have a realtech network interface card (I have intel) so that can't be causing the problem. I also have installed the most recent drivers. Any help? Thanks.
I switched PSU cables to the default PSU ones and it still doesn't work. I was originally using a two 6+2 pin to 2pin molex adapter. I have a Wireless Card in my 4th PCI-E slot in my Motherboard. Is this the reason of my problems?