I also have an A8-5500, but what you are proposing to do with your Ram will not help the graphics core at all.
Are you wanting better performance in gaming? If you are wanting more Ram anyway, make sure it is at least DDR3 1866 or higher, as this APU loves Ram speed!!!
If that is the case, you can go "Duel Graphics" and buy a cheap 6570 card and put it into the PCIe slot, then change the setting in the Bios, fire up CCC and enable "Duel Graphics". This should give you about a 75% or more boost in most games.
If you want more performance, then just buy a mid range discrete 7870!