If you're trying to drive 4K, I would look at the power of the thin client, and maybe try putting a graphics card there, rather than in the server. I'd also ch

If you're trying to drive 4K, I would look at the power of the thin client, and maybe try putting a graphics card there, rather than in the server. I'd also check your choice of RDP client -- are you using the official Microsoft client or a FOSS one? I believe there are extensions to RDP that basically wrap H.264, which you'd probably want at that resolution.