New
#11
USB ports are overload protested. If you draw to much current from them they just turn off. It's not due to ready boost.
External Graphics card? I use a USB external monitor on my laptop as a second display. It has an external GPU in it. It doesn't become usable until Windows has booted up fully. After I have logged in. I'm running in Extend with my laptops screen set as the Main display. I have never tried to run it stand alone in "second screen only mode". Not sure it would work that way? I'd have to try it to see. Even then you likely wouldn't see the BIOS POST screen etc?