I just purchased the Lenovo Y50 UHD touch. It is a 4k laptop with a NVIDIA GeForce GTX 960M video card running Windows 10. Windows Explorer seems to hover around 20% CPU usage, which I find odd and sometimes it jumps so that the CPU usage is 99%. I also tryed downloading a 4k video and playing it with VLC Media Player and it just is utter crap. I even renamed VLC's .exe file so I could force NVIDIA to use the 960m rather than use the integrated card.