4k video editing system

I'm trying to get setup to edit 4k video, I am running the current system: Processor: 1 x Intel® Core™ i7-4790K Processor (4x 4.0GHz/8MB L3 Cache) - Intel® Core™ i7-4790K Memory: just upgraded to 32Gb of DDR3 Ripjaw Video Card: 1 x NVIDIA GeForce GTX 980ti - 6GB - Single Card Motherboard...