well if the temps were not that high to begin with I would guess that maybe something came loose. Have you checked the heatsink to make sure that it is still securely attached? Clean out yuor system of dust and ensure that all of your fans are working correctly. Does your case have good ventilation? It wouldnt be a mobo issue as to why ur cpu is really hot and as far as PSU goes that wouldnt cause the high temps either but that could be the cause for the low fps.