yep it does mate

i thik its a case of finding the balance between power and lifespan of components and battery

to be honest i think 800mhz worked pretty well however with 900mhz it idles at a reasonable speed 125mhz -- 500mhz depending on processess running and that is under stock speeds still

it just has the overhead space if needed

like you say though its a 50% increase which is a large increase whatever way you look at it

id think 800mhz would do and would probs be better on the battery

lets face it the n900 is powerfull anyways its just giving it that extra room for manouver we need to stop it maxing out and juddering etc in places