Decent Gaming Laptop?

For an APU, the faster the RAM, tighter timing and running in dual channel helps. So if there is only 1 stick of 4 GB RAM, putting another in to run in dual channel will make games run faster. Although the APU is only able to run recent games in low to medium.
 
If you are relying on integrated graphics, then it is best to play games at 1366x768 and with a mix of low / medium settings depending on the game. Some games can be playable at medium settings while others will require low settings if you are interested in decent performance. Some very graphics demanding games may not be playable at all.