Make sure you are running the latest drivers for both your video card and bios. Try to remove any unnecessary processes running in the background and use a gpu monitor program to make sure your card is being clocked correctly at the performance speeds when running graphically intense applications. I use the program TechPowerUp GPU-Z
to check this, but make sure you click on the sensors tab and enable "continue refreshing this screen while GPU-Z is in the background".
You should noticed that running your desktop you should see it something running like 1/10th or 1/20th of the rated speeds for your core, memory and shader clock. If you aren't hitting your rated speeds, then either one things could be it.
1. Some sort of application or process is running in the background that hinders your card from running in full potential. This could be multiple services or applications running at the same time that would access your video card sensors.
2. Some sort of driver issues that keep the card running in 2d draw mode. You can try to force the driver to run in "prefer maximum performance" mode under the power management mode setting in the Nvidia Control Panel.
To access this CP, right click on your desktop and go to Nvidia CP. Then click on the 3D Settings >> Manage 3D settings selection from the left task bar. Scroll down to "Power management mode" and set to max performance under the "Global Settings" tab. Also select the same max performance under the "Power management mode" under the "Programs Settings" tab.
If you still have issues, try starting windows in safe mode, uninstall your display drivers, run ccleaner and re-install the latest display drivers.
3. If you still have issues, then see if any HIDs(Human Interface Devices) is preventing the graphics card running at full steam.
If all else fails, visit your manufacturer's website and search their forums (EVGA forums is a good source to troubleshoot) or put in a troubleshooting ticket.