Your motherboard only has a 4pin power connector so are limited to 95W chips. Also if you go the 8 core route your motherboard lacks heat spreaders on the vrms which is important for AMD motherboards especially those with 8 cores. The 8120 would be the best possible upgrade but you would be limited to the 95w version. If I was in your position I would either get a new motherboard with the fx 6300, or I would get an fm2+ motherboard with a 860k.