Do you even know what you're talking about?
All FX processors be it 4,6 or 8 cores. Run at the SAME max temperature of 62-65C safe, any higher and unsafe.
The only issue with buying an fx-8 processor is you need an aftermarket cooler.
Sure programs don't use 8cores but why is it that the FX-8320 beats the fx-6300 in gaming then?
I don't see why you're bashing the 8320, The fact of the matter is the FX-6300/50 competes with i3's and the 8320/50 compete with i5's