Is there a limit? I have an 8 GB on the way, but unfortunately, I have a tad more ROMs than that. Would be better organized to keep everything on the card at once instead of swapping files around. When I get my card, maybe I can experiment w/ reducing file sizes. If it's an 8 gig card, does it actually hold 8 gigs...or is it less (as in possibly 7.something)?