Which MacBook Pro supports 4K GPU render in Adobe Premiere Pro CC 2017?

Anyone know which video card supports 4K GPU render/live 4K timeline playback?

I had an iMac 5K (Late 2015) AMD Radeon M390X 2GB with FCPX 4K timeline playback and render was fast and smooth but Adobe Premier Pro CC 2017 even though it said GPU render was stuttering pretty bad. Tried Metal, Open CL it was slow. Wondering if FirePro is better for 4K in Adobe PP CC 2017?