Steam is upgrading its in-game frame rate counter to be a full overlay This will provide a lot more details on what's going on under the hood with any given game, and your CPU and GPU's status too ...

TL;DR: Steam Client beta participants can now view detailed performance metrics through the in-game overlay. While it doesn't offer as much data as advanced tools like Afterburner, Valve's new ...

New Performance Monitor with Detailed FPS Data Steam's In-Game FPS counter is now expanded to become the In-Game Overlay Performance monitor.