To anyone with a an Asus Z97- Pro Gamer and running with win8.1. Remember do not ever flash your BIOS to version 2106.

What will happen??

1. Random blue screen concerning DRIVER_IRQL_NOT_LESS_OR_EQUAL XHCI.sys
Since Win8.1 already has native USB 3.0 support, you cannot update the USB driver for it.

2. Auto Restart when low CPU load, example : watching online stream drama requiring flash plugins. However, when gaming it is okay.

Please flash to BIOS version 2107 if you have symptoms like above.