nickelliott17

So i recently built a gaming pc. I was wondering if i should get a another gpu. specs: i7 4790k\ asus z97-a 32gb hyper x fury msi radeon r9 390 850 watt corsair power supply. should i get another one for 4k and 1440p gaming or should i save up for a gtx 1080? Do i have enough watts??