How many render targets can I create at runtime before there is a performance hit?

I have a game in which I need several hundred render targets. Will this ruin performance? The targets are only 32x32 but there are a lot. What is the best way to do this?

Typically, if you have a decent size RT ( screen size ), the most you can have is 1.

These are small render targets. Best thing is to try it, but I think you’ll hit problems around the 50 mark.