should i get a second gtx 580 or a single gtx 960?

[thedarkrein]

My pc has a amd fx 8350, 8 gb ddr3 hyperx ram, msi 970 motherboard, cx600m 600w psu and a single gtx 580 sc and i need an upgrade as i want more than 2 monitors and the 580 can only support 2 monitors.

 

[king3pj]

Im definitely not anti SLI but the 580 series is pretty old at this point and 600W is not enough for SLI, especially when you have the CX series. I would get the 960.