What is nvidia gpu performance scale in BIOS?
Solution 1:
turn it ON! Nvidia Card does scaling if this option is on, less latency then onbaord intel gpu. Use it if you play games. TUrn off if you want that intel does scaling, this involves scaling problems but better performance if use your gpu for rendering where latency doesn´t matter.
And of course turn it on if you have the UHD Version of Y50 - less laggy feeling, less errors from games when they want to scale.