Existing RAID 0, will it work with new mobo?

First of all, when you ask a question, be sure to give all required information. When talking about compatibility of RAID controllers, both matter - the old one as well as the new one. And please, do just say Rampage Formula, it's really an unneccesary step to jump through links to find out what you are talking about.

In your case, I suspect it wasn't an X48-based mobo you're migrating from.

Here's the deal about (chipset) RAID controllers in general. There are no guarantees, even if they come from the same manufacturer (i.e. nV to nV; Intel to Intel, etc.). However, going with the same manufacturer does increase your chances, which still remain pretty slim.

Sometimes, mobo makers stck a third party controller on the mobo, in which case you need to know what controller you are attached to. Rampage Formula does not have a third party controller with RAID capability on present, though, so you're limited to X48 southbrige (ICH9), which I think is the same as X38 southbridge, actually.

Good luck.

Yet another reason why RAID0 is a dumb idea on the desktop.

No. RAID is proprietary. This is why a RAID card is recommended so you can transfer from one computer to the next.

You will lose all your data if you attempt it.