Do you really have to have 3 identical certified monitors to run a 3 monitor setup with Nvidia? I have read that before but would like an answer from someone who has a 3 monitor Nvidia set up.
Now I am looking more for information regarding an SLi setup vs a single card like a GTX580 since I am trying to plan out my next GPU. I currently have a GTX460 and am trying to decide if i should get a 2gb 6950 for eyefinity or if i can get away with 2 SLi'ed GTX460's for 3 (or more) monitors which are not the same brand.
You need to have 3 identical connections. Either they all must be digital DVI, or all 3 must be analog. All 3 monitors must be of the same resolution, refresh rate and sync polarity (not sure what this is) as well.