Acer Aspire 5745G: replace or add dedicated graphic card?

As this computer has a duel vid card system with an intel chip on the board and a dedicated card to switch back and forth to ,for power saving,whatever card you switch to needs to be compatable not only with the motherboard but the intel chip that's running the low power draw side of the computer.There could also be an issue with power as this apu820M requires more power you will also need to boost your ram. Minimum ram needed is 4gb, 8gb if you want it to work well . The money needed to do the upgrade would probably go a long way towards a better laptop...just sayin

Hope this helps and good luck