Thread: Overclock the N900?
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egoshin is offline egoshin
2010-04-23 , 00:22
Posts: 992 | Thanked: 995 times | Joined on Dec 2009 @ California
#3246
Originally Posted by esthreel View Post
Thank you for the info, good explanation. So there are warnings all around about overclocking shortening your nokias life. But if you are not overvolting it and thermal stress is usual thing (stock voltage is even higher which means more heat under load, more thremal stress at 100% load) If I am not misinterpreting your post, the custom kernel voltages and MHZ are even healthy for your device, of atleast not harmful if you have a good chip that works undervolted at 850Mhz with no errors even if it was not designed to.
It is difficult to say. The total energy from battery definitely increases with higher frequency even you run with low voltage. And most of that energy dissipates on CPU.

Just to understand better that a small example. I ran a stock kernel and measured a current from battery under different frequencies. The 250MHz (playing MP3 music) takes only around 110mA but 600MHz (hard loop in shell) takes TEN times more - around 1400mA (screen is dark etc). But CPU VDD1 voltage still differs only 1.26 times (1.58 in square).

So, the biggest power consumption increase is in frequency increase.
You still may have more bigger CPU current under high frequency which heats CPU more even with decreased voltage.
Last edited by egoshin; 2010-04-23 at 00:26.