12v rail wattage wise, it would pass as its max is 360w, and the 7850 should not ever even pass 300w on load. though as for the other things that are nice on a psu like over voltage control, under voltage control, over/under power control etc I cant guarantee
what happen when it explode? does this damage other pc parts like graphic card or motherboard?
A cheap PSU can fry your mobo (hapened to me twice befoure I,ve learned).