Its just ultimately low quality with a 4 phase setup (essentially a pro 3 with heatsinks) .
Many people have had issues running 8350s at stock on it let alone oc.
If I had that system running & it was stable with an 8350 I'd personally be considering myself lucky & leaving bios settings alone.
An 8 core at 4.5ghz isnt by any means a 'small overclock' , on that board it'll need 1.45v+ & those vrm's won't handle it without overheating.