Possible to set fps based on devices?

I’ve seen this question mentioned before but I couldn’t find an answer. Is there a way to set fps=30 for low end ipod touch 2G while fps=60 for iphone 4? My app runs great on the latter but is almost unusable on the former. I wonder whether I can adjust based on devices.

Thanks. [import]uid: 8745 topic_id: 6808 reply_id: 306808[/import]