Nvidia 2D surround question

Hello,
I'm building a new Desktop and I've been searching for a list or table or something of 2D surround compatible cards from Nvidia or are all cards usable for this purpose??? if any dual set of cards in SLI can be used that would be great because i have no care for 3D which i know can only be used on certain cards as far as i am aware.

basically my question is, can i use 2D surround with any pair of Nvidia cards or do i have to buy a specific set.

Thanks in advance