Same issue here dude, i can play games like Evolve, DCS World, War Thunder just fine but games like GTA V and Battlefield 4, they constantly crash, sometimes even freeze my entire PC with audio stutter.
Have the same issue here too. GTA V a can only play in safe mode because in normal mode it crashes the PC and force it to restart. BF4 and Arma 3 I can't even get in to the configurations, they crash during loading game.
I've tried almost everything, clean install, repair registry, older drivers, install catalyst again, increase voltage in BIOS, change pci ex slots, full ant virus check etc.
All this happens after install driver 16.7.1 and touch the " WattFman" for the first time. One I noticed is I can't check the GC voltage because none software shows it. I already check the energy cabes and everything is ok sending 12v to the card.