The A6-3420M APU won't turbo when the HD 6520G graphics is in use.
But it's also the best deal you'll find in your price range.
For RTS, the A6-3420M @ 1.6Ghz isn't ideal - it's much better at FPS.
Which RPGs are you most interested in?
AMD Radeon HD 6520G reviewhttp://www.notebookcheck.net/AMD-Radeon-HD-6520G.55734.0.html