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.
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Intel Core i5-2500K @ 4.20GHz
Asrock Z68 Extreme4 Z68
Kingston HyperX Genesis Grey 2x4GB DDR3 PC3-1280
Intel 510 ElmCrest SSD 120GB
GeForce GTX 580 3072MB
Windows 7 Ultimate 64-Bit
Corsair HX1050 PSU
Corsair Hydro H80 CPU Cooler
Silverstone Fortress 2
Hazro HZ27WA 27" 2560x1440
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