You are better off uninstalling all NVIDIA Drivers and EVGA Precision X if installed before you install a new Video Card Model.
Unplug your Network card before you start, Windows 8.xDo not save any profiles when you uninstall EVGA Precision X.
Reboot your PC and allow the Default Video or VGA Drivers to install and then reboot one more time.
Logon and then turn off your PC.
Remove the GTX 780 and install your GTX 980 and allow the PC to install the default VGA drivers and restart your PC.
On a Side Note that I have learned to do is delete the two Keys listed below.
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Video
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Control\Video
It will error and say it cannot delete the Key, but that is ok as it cannot delete the Key itself nor the Default VGA Driver GUIDs.
What it will delete is all the GUID's for NVIDIA's Drivers. REBOOT After you delete the Keys.
This is the last item that I do before I install a New Video Drivers.
Logon your PC and now install the NVIDIA Drivers.
post edited by bcavnaugh - Saturday, September 27, 2014 8:05 PM