I tried my SP3 out with my 4k monitor today. I used a mini display to displayport 1.2 adapter and got the full 4k at 30hz. Plug and play worked exactly as expected. The only downside is that I was limited to 30hz. I do have the i7 variant of the SP3 and was hoping the slightly improved integrated graphics card might be able to output at 60hz, but even the fact that the tablet can do 4k at 30hz is pretty impressive.