N series and X series SFP compatability

Does anyone have any information on SFP compatibility for the newer N and X series switches? I've looked everywhere and can't even find a part number for the official dell ones.

Basically I'm wondering it the older Dell SFPs from powerconnects will work in these without throwing an error? What about the Avago and Finisar models that work in the sonicwalls?

Anyone who has one of these I'd really appreciate some info before we go ordering a bunch of them.

Thanks.