I'd recommend making certain your BIOS and drivers are current. Latest BIOS is Version 2501. Asmedia SATA Controller Driver and Realtek Audio Driver have fairly recent updates.
Grab the latest AMD chipset drivers here.
Once those are current, perform a clean graphics driver installation:
I'm running Catalyst 15.7.1 on Win 8.1 and it has been excellent for me.
Hope this helps. If the proposed answer is correct, please mark it as such.