The Galaxy MDT series are the only single GPU GeForce cards prior to the 600 series that support more than 2 displays, and they do so with special integrated hardware that splits one or both discreet outputs to multiple screens.
If you're looking for an inexpensive card for triple display gaming, the GTX 650 Ti can do this and will outperform a GTX 560 SE by a fair margin.
What are you wanting to do with it?