Setting nvidia gtx 690 SLI

That shy improvement was really weird. It was wrong indeed. I installed the GPU observer widget and it gave me the clue. Only one GPU was in use. Then I started searching how to enable both and I found this application, nvidia inspector, made by the same author. It's the same than the nvidia Control Panel but much more advanced. After a while, I found the correct configuration.

So now the performance is incredibly high!! From 10 fps to 200 OMFG