graphics settings

 Is there any way for me to edit my own graphics settings. I run a 290x lightning but being water cooled i can run a big over volt to get stable at 1200mhz gpu / 1500mhz mem vs 1000/1250 stock. I was wondering if there was any way for me to try higher settings to take advantage of this. Like for example the settings in games where you can turn things up or down to get your desired frame rate without going over your vram limit. Custom tuning your own graphics settings?

Might be something here -

I made some of the tweaks.