alexc24 :
pete_101 :
The graphics card is the weakest component, the GTX 1060 3GB is not suitable for 4K gaming. If you're serious about 4K gaming then the GTX 1080ti is the current go to card.....but when you see the price of them, you may have second thoughts. What is your budget?
Unfortunately the highest I can go is probably $600 :/
Ok, I assume you're talking $600 USD, if so, then that's enough for the GTX 1080 (non ti). Your current card would cost you from $280-400 depending on the model, so it has some value on the used market....especially if it's brand new. I'm not sure of the best place to sell the card, someone else may know, if you could get ok money for it + your $600 then you may yet be able to afford a 1080ti.
Look, you've good a great CPU on a good motherboard, it should be a really good gaming PC, the only thing it's missing is a really good graphics card to go with it.