When I'm using my 4K monitors one on my 780 the other on Intel integrated (so they both runt at 60hz) my mouse doubles on the left monitor but sits at the edge and copy's my mouse (changing to a pointer,Busy,select,ect) it usually sits right there on the left edge or between the two monitors. I have no clue Why it does this, I've reset the Intel settings. This only happens when the resolution on the Intel screen is set to 4K.