Both Metro and Hawken do have their fps problems it seems. So it's not a hardware problem anyway. And should'nt be as you say Skyrim are ok. And I guess Windows and other software works as they should?
I read these souloutions for Metro Last night:
1. Disable SSAO in the Nvidia control panel. Right click on any space at your desktop. Open the Nvidia contol panel - 3D settings to do this.
2. Disable PhysX instead. This as Metro last night have an older version of PhysX pre installed. And they might create a conflict.
Disabling NVIDIA Physx GPU acceleration
3. Update your soundcard or soundchip driver. But before installing the new one. Unistall the old driver in the Windows control panel first.
Hawken. Try this: https://community.playhawken.com/top...rds-in-hawken/
Hope any of this will solve your problem? Othervise, go to the forums for these games and ask for help.