Windows PC is using CPU instead of GPU [Fix]

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

Here's how to decide what part in your gaming PC needs upgrading

Change only what absolutely needs it ...
XDA Developers on MSN

5 hardware bottlenecks that aren't your GPU

There could be more problems outside your graphics card.
PC World

PC bottlenecks explained: How to know if your CPU or GPU is limiting games

If your PC doesn’t deliver the desired performance in a particular game, it’s usually—but not always—due to two limiting factors. Either your processor (CPU) or your graphics card (GPU) is ...