@Wiidesire
Haha feels great that the staff at Plex dont even know what they are talking about. Makes me understand why the software has so much issues/bugs. 
So which AMD GPU do you recommend for me? The latest and greatest or would some older model work just fine for a couple of 4K transcodes? (how many can you do on your GPU?)
EDIT: it just hit me. im thinking we all are talking about different things.
Im talking about GPU.
perhaps @BigWheel is talking about CPU (the built-in graphics on the CPU chip)
And im seeing now that you are talking about CPU as well @Wiidesire.
So the question still stands, can i use AMD GPU (PCI-e), NOT CPU graphics, for HW-transcoding?
EDIT 2: Bought myself a Nvidia Quadro P2000, ill install it in the server on monday. Hoping it will work fine. Or else im back on the AMD track.