Math Geek said:
pretty much just as bruce said. if your monitor is plugged into your video card, then that is what the pc is using. if you are having performance issues with the card, did you uninstall the integrated drivers before installing it? this still counts as drivers and needs to be removed to prevent any issues.
of course if you are plugged into the motherboard, then you are using the integrated and need to swap it over.
check to see how you're connected and then delete all video drivers in the system. you do this through the device manager. select "display adapters" and then open each entry and click the driver tab. there should be an uninstall button to remove the drivers. then reinstall only the drivers for the 290x.
you are right about the performance. you should be seeing very good fps on high/ultra at 1080p easily with that card. try this out first then come back if it is still buggy and we can move to the next option.
edit: another thought that is unlikely but still a possibility. what psu are you using? that is a very power hungry card and if you are not feeding it enough power, it won't run well at all like you are seeing.
Thanks very much for this. A lot actually maks sense even to a noob like me. I will check whether it's plugged into the motherboard or not. Also, this is a brand new PC so no old drivers on it. Im also running the Corsair RM1000 PSU.