If you can set MSI Afterburner something like this -
Then you can show when the spikes are showing and such. There will always be a little movement on the GPU core speed in games because of the way GPU Boost 3 works, I do prefer the older Nvidia cards as you can control the boost/overclock a lot more but this way it takes out the overclocking in a way from the user.. Makes it kinda boring really... But still, try running Heaven or Valley or something in a window, then have this detacted from MSI, it'll show you all you need to know
Can even get it on screen as above so you can see in test if you use full screen mode