looking for a new card for triple monitors

[packer28]

hey guys heres my specs first
3 X AOC E2250SWDAK 21.5 inch monitors
Intel Core i5-3570K
AsRock Z77 Pro4 Motherboard
8GB Corsair (8GBx1)
Radeon HD 7970 OC Boost - 3 GB GDDR5
250gb ssd
3 Terabyte UDMA600
CORSAIR CX600M 600 W
Windows 8.1

Im going to try nvidia this time cause last 3 games ive tried dead rising 3,assassin creed unity and far cry 3 just not near 60 fps
I really dont want to buy a new psu or an i7 ,so is my system suitable for a gtx 970 or maybe 980
Thanks kevin

 

[faalin]

both 970 and 980 will work with the 600w power supply.