Remove all the dust from the heatsink and fan assembly in the system -- just a thin layer will insulate the heatsink and prevent it from doing its job. Similarly, heatsink pads/compound dry out over time and become less effective at heat transfer -- that's why they need to be replaced periodically. It is very possible the nVidia GPU is throttling back if the system is running too hot.  
Hi  I am having an issue with my Dell Laptop as this hasn't happened before. The gtx 1050 card itself doesn't seem to be used despite it showing in the device manager as well as task manager. In the task manager when running games its the intel graphic card that is being used instead of my gpu. I can tell since the performance of my games are really poor, games as old as borderlands 2 and hollow knight have frame drops which makes them unplayable. I have tried forcing it in the graphic settings but i still dont see much happening. Not to mention the card itself doesnt show in the Bios itself.  Would like to know if their is a solution to this [IMAGE]  
Dell XPS 15 9560 Graphic Card Issue