I bought an Asus A8 in jaunary, I upgraded the graphics to the Radeon 7770 and the PSU to a 750 watt. Will my motherboard support the A10 6800k 4.1 GHz processor?
Cannot say without the actual model number of your motherboard. If your board supports it, the only CPU I would consider would be a 760k. Buying another APU is a waste of money.