You can't pair your GPU with that APU. The APU will run the weak integrated GPU with the strong one, which will give a MASSIVE bottleneck. You would be better off getting an Ivy-bridge CPU or if you're against Intel, you could get a decent vishera CPU from AMD, which won't perform as well as an Ivy-bridge.
No... He can just disable the built in APU and run it as pure CPU.
The problem is that the cpu is weak, too anemic to properly run the separate GPU he has.
He needs to overclock that sucker, until an upgrade can be had.