Need a 600$ budget computer build.

[hikaricloud]

Well, he won't need to hybrid crossfire playing Runescape. But he has the option later on.

Take a look at these bunchmarks: Benchmarks - The HD3200 Graphics Unit Of The 780G - Review Tom's Hardware : AMD's New 780G Chipset Has Powerful GPU

Also, you can easily overclock the onboard GPU and it gives you a great boost in all tests: Overclocking The Graphics Core By 90% - Review Tom's Hardware : AMD's New 780G Chipset Has Powerful GPU