I have found a problem with video cards on older computers that I've converted to Windows 10. Win 10 comes with a generic video driver that seems to work with just about every video adapter, but it doesn't work very well. If your video card manufacturer hasn't come up with a Win 10 driver, chances are that you will have inferior video. I understand that Nvidia is very cheap about this, and hasn't come up with drivers for video chipsets more than about 5 years old.

-Joe-