Hardware.Info posted 4K Gaming PC - April 2015
A quote from the article:
After a few years in which little happened in the area of PC displays, the 4K revolution is finally taking place. Graphics cards have to render four times as many pixels to drive a 4K display, while the game textures are only getting more detailed. In short: you need real horse power to game in 4K.4K Gaming PC - April 2015 @ Hardware.Info
A fast processor and especially a graphics card is a must. For now, you even need a couple of the latter. However, the rest of the configuration needs to be balanced as well. Since many gamers prefer to overclock their PC to improve performance, it is important to choose a motherboard that is suitable for this.