What would give me the best performance increase?

[JG5_emil]

Thanks Granthos

Partly I want to be able to run a third screen for work so a second 580GTX would be good but I read somewhere that the 680 can run up to 4 monitors.

I think you're right about the VRAM though, my 580 has 3 gig and another one of those would be nice as I am sure the 2560x1440 resolution I use benefits from this.

[Friedric]

I would do wat Granthos says .

[335th_GRAthos]

I use MATROX TrippleHead2Go for the past seven years (lost counting).

Never had problems, always had three monitors connected

Always SLI.

Until, thanks to CoD I had to run the game in single mode.

Then I realised (removing the second GPU) that I can have three monitors, 3840x resolution on a single 570GTX 1,3Gb

So, my advice would be:
#1 MATROX TrippleHead2Go
#2 If it is for CoD, do not bother (yet), three monitor view like IL2 does not work

~S~