New mobo and CPU are the first requirements, then an upgrade to 32 GB, last a nVidia GTX 750 or better.
A 970 on this system is money down the drain.
What CPU would you recommend I go to? There doesn't seem to be much better for under 500. Am I missing something or am I going to have to spend that kind of money to get the performance I need.
An unlocked i7 quad core with HT or better (6 or 8 core).
The processing for 4K is significantly greater than 1080 media. I would definitely consider a different CPU and 32GB of ram. A 970GTX would definitely be the way to go either way.