Geforce GTX 680 2GB or GTX 670 4GB ?

[cupshaker]

Hi,

I'm a motion designer based in Switzerland (Geneva) and I am seriously thinking of moving to Octane render engine for some of my work.
Actualy, my workflow involve Cinema 4D (lots of mograph and dynamics, larges scenes are comon) and After Effect (Post & motion design).

My old Geforce GTX 470 has just died last week when I was about to purshase an Octane standalone liscence...
Anyway, I wanted to buy a new set of of GPU for octane and I was thinking about those setup:

My budget is arround 1000$.
(Retailers are based in Switzerland so I can't find any better price!)

Setup 1: 2X Geforce GTX 670 4GB for 880$ (best deal I think. Am I wrong ?)
Setup 2: 2X Geforce GTX 680 2GB for 888$ (not sure if 2Gb is enough...)
Setup 3: 3X Geforce GTX 660Ti 3GB for 1011$ (my psu should endle this fine, but what about energy cost?)
Setup 4: 2X Geforce GTX 680 4GB for 1108$ (would be the best for future extension, but does it worth it ?)

So, What should I chose ?

Thx for your advices. And If you have any other setup to sugets I'd be glad to here them!

[mbetke]

If you run large scenes you would maybe go for the two 680GTX with 4GB each.

I have 3GB and if you render a large resolution you will need some extra vram. 3GB is nice because you dont have to start a lot of optimizing the scene and spending time there. With 4GB it will be even better.

Maybe at March there will be new set of Nvidia customer GPU. I wait for it at the moment. So if you like to wait too then why not getting a smaller GPU for less budget now and upgrade with next gen nvidias.