Could you please elaborate on this? I'm using onboard intel graphics on all my rigs, both amd and nvidia, and I did have some issues with amd systems, but have always just assumed that it's due to their buggy drivers and all the nonsense with modded bioses, paching etc. I've only got one rig with amd cards that doesn't use onboard graphics, and it is indeed the most stable among them all. So now your post made me think that maybe I should try disabling the onboard on all my amd rigs. OC settings don't seem to be blocked though, I'm using overdriventool and it works fine.