If your PC is using CPU instead of GPU, check your cable connections. Use the fixes provided in this article to resolve this issue.
XDA Developers on MSN
Enabling your CPU's iGPU can be a game-changer for your gaming PC
Let's stop underestimating integrated GPUs ...
While gaming using Steam’s Big Picture Mode can be extremely helpful, as it offers a slick, console-like experience, it occasionally defaults to using your integrated GPU instead of your dedicated GPU ...
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