That worries me pretty much - sometime my (not-yet-overclocked) N900 is pretty hot and stay that until switch OFF/ON. I suspect SGX but who knows...
I forgot to mention, I noticed mine warm up surfing on 3G. That said, I haven't played anything other than Bounce that is GPU heavy. Overall though, I still think most times when the N900 feels hot its the battery warming up due to heavy drain.
ps: the 800mhz kernel is not that much faster - than a 600mhz. i leave it anyway as it may increase battery life - i am not such a gamer - so probably the effect in overclocking is not dramatic then !
That's funny as the 900Mhz kernel is infinitely faster than 600Mhz, things are instant that were seconds before. Not games, everything. I noticed immediately that bootup was super fast, everything is more responsive.
That's what I want to know..once the PR 1.2 update is up..will it revert back to 600 mhz?
I'm fairly sure it will revert back to "normal" non-overclocked state after the PR1.2 update. I've noted about this in my guide I believe. Check my sig.
And yes, OTA will work just fine. But I do recommend for everyone to perform major firmware updates without the N900 overclocked. This should just be common sense to anyone who performs the overclock.