Radeon HD 7870 Crossfire or New GPU

sujupwns

Honorable
Jan 4, 2014
9
0
10,510
I want to upgrade my pc a bit.

Current specs i5 4690k , hyper 212 evo, Asus Radeon hd 7870 2gb ghz edition, cx 750w corsair psu, 8gb Kingston hyper x blu, Msi z97 g55 sli motherboard, 1tb WD Drive, 240gb Samsung ssd.

I was wondering if I should get another 7870 for crossfire or sell my 7870 and get a gtx 970
Also with crossfire how much performance does it add and how much more heat output does it add and will my cx 750w corsair psu be enough for everything?
How does radeon HD 7870 crossfire compare to a single gtx 970
Does crossfire have a lot of bugs or is it hard to setup?