Ya gotta know if there were dip switches mine certainly wouldn't be anywhere near the OEM settings ;-) But I too am tremendously interested in Confused's theory of identical parts shared between 200/250 and only firmware is dissimilar as I believe a bump of 50 would be child's play for my D200 at this point temps-wise. If components were identical with 200 I'd jump straight to 400 without a worry in the world of overheating. I can always make it run cooler ;-)
Statements in my posts are opinion only, not to be construed as fact. Any projects I engage in are at my own risk! Their outcome cannot be assured and may result in success, small/no change or catastrophic failure. I encourage no one rely on anything I say or do as gospel and to realize your mileage may vary!