Question about decrease in framerate with dual monitors after upgrading video card

[yabai]

I recently bought a gtx 1060 to replace my gtx 950. The past few years I've had my main monitor that I play games on and stuff connected to my gpu, and my second monitor running on integrated graphics because I just use it to watch movies and stuff. It worked perfectly fine with my gtx 950, but now that I'm doing the same thing with the gtx 1060, I've noticed that when I'm playing a video on my second monitor, I get a decrease in framerate on my main monitor. If I pause the video on my second monitor it immediately goes back to normal. My only guess as to why this is happening is that when I had the gtx 950, my bottleneck was the gpu, while now with the 1060 it's my processor that's the bottleneck so when I use the integrated graphics it affects my framerate. My processor is an i5 4690k. should I try both monitors running off the gpu and see if it changes anything? Thanks for any advice you can give.

 

[2is]

Integrated graphics use system memory and thus system memory bandwidth. If the game you're playing is heavy on memory bandwidth I can see how it may result in a slight hit to frame rates

 

[lupi]

Have you made any other changes. Some motherboards have shared lane issues when you add or enable features.