its an APU so it uses system memory. performance is gained from increasing the speed, but you just want it playable. whats the model of the motherboard? i dont have any actual experience with an APU but my guess is there's a BIOS setting or maybe even in Windows that allows you to allocate RAM to the onboard graphics. not sure but i would also guess that there would be a poor experience even if you do get it running, so do you have any upgrade budget? $100 would get you playing, $200 would make it almost entertaining, $500 enjoyable, etc.