I have a non-WiFi version of the C7H and I have a Creative Sound Blaster X7 Limited Edition USB DAC connected. On BIOS 2306, I have no problems with booting up, but I've tried both 2406/2501 and my computer hangs on the boot logo endlessly until I disconnect the DAC.
Everything else works fine, it's just a weird problem with this. I've updated all drivers and firmware for everything on my PC.