Hey everyone, just want to share some user experience about the topic.
I've been using my n900 for about 3 months and almost a month OC'ed (900, recently - 1000). Btw I am using latest kernel-power from repos and temporary oc through queen beecon.
When I was using 900mhz setting the device temperature remained fine, unfortunately I even didn't monitor it but the general feeling was about that nothing changed in terms of heat if to compare it with stock frequency.
Then I tried 1ghz and surprisingly found out that the difference in terms of speed betwen 900-1000 was almost as noticeble as between 600-900 so I decided to give it a try. Ok, I agree that it's very argueble point when we are speaking about perfomance, but for me it seemed to be noticeble faster. Later on I also found out that the device temperature rises alot at this frequency. I am using bq27x00_battery module to monitor the temp. I know it is not reliable, but it the only way to convert feelings into numbers.
Well, from a few tests that i've made I found out that with 1ghz temperature exeeds 50' degrees (my record is 53) at full load (e.g. watching youtube video) and ranges between 45-50 while active browsing. It makes the device very hot, especially when touching its hw keyboard. And with 600mhz (not that "stock" as it seems, cause kernel-power uses different voltages than stock nokia kernel - am i right here?) temperature rarely get over 45 and it is usually about 40 at decent heavy load.
After some research here, it seems to me that i found the right explanation: the 1000mhz uses 1.350v which differs from previous used voltage for 0.075 which is pretty considerable in terms of voltage settings used by device. Is this the real reason causing heat?
And one more question: did i get it right, that if I installed latest kernel power + settings and just set limits to (e.g.) 250 1000 I get the same voltage table as listed as "titan's LV kernel" on the wiki page?