Same card as mine and I use Shadowplay for everything
Things that go bump is sometimes the microphone shuts off by its self and you have to turn off Shadowplay and turn it back on.
To do full screen captures you will need to use a Windows Aero theme and in SP’s preference check Allow Desktop capture.
The cool thing is it’s just there, just like your mouse, and you only need to hit alt-f9 and off you go.