Boot / USB problems

[Lotek]

In a SLI configuration should I run power to both the 8 pin and the 4 pin power inputs as well as the 4 pin molex? I'm having boot issues and USB resource problems. I'm running two GTX Titan X video cards and a Corsair AX1500i PSU.

[Chino]

Yes, populate both the 8 pin and 4 pin power connectors on your motherboard.

Regarding your USB problems, please explain with detail. Also list your complete system specifications including every USB device connected to it.