Re: Why does Nokia give us such a low default 600MHz?
 

And the default is really 500, 550 and 600 are overdrive and the processor's manufacturer says it'll halve the lifetime at 600 ;)

Re: Why does Nokia give us such a low default 600MHz?
 

But how long do they expect the cpu of the N900 to last with the standard 600 mhz :confused: I'm tempted to oc mine but i want it to last as long as possible. I just love this phone and the openess of it, so it would be a shame to shorten the life spand of it i think :)

Re: Why does Nokia give us such a low default 600MHz?
 

Wrong calculation. To work on high frequency the CPU currents should be increased proportionally (linear). But energy consumption increases quadratically (W = R * I * I). So, the linear increase in CPU performance is adjusted by quadruple increase in power consumption.

EDIT: well, I am not completely honest in this calculation, only part of CPU wires is a subject of that and I didn't take into account the decreased time. However, it is true - per any given number of CPU cycles the high frequency cycles take more energy.

Re: Why does Nokia give us such a low default 600MHz?
 

That's the thing... If the processor has an expected life of 6 years, I wouldn't really care if I halve it to 3... 3 years is a long time to use one phone.

Re: Why does Nokia give us such a low default 600MHz?
 

Because there is something like N920 or N900 mini or something else will come with 1 GHz :) sales strategy

Re: Why does Nokia give us such a low default 600MHz?
 

Given my experience with embedded systems, to be honest I'd be shocked if anyone's CPU died, even after a year locked 100% load at 1ghz. 50C just isn't that hot.

The spec sheet publishes the worst-case-scenario.. theoretical minimums/maximums. But frankly, I bet the things to fail in our phones will be the switch-mode power supply, offchip capacitors, radios, etc... long before a 1ghz OC'd CPU.

Re: Why does Nokia give us such a low default 600MHz?
 

because nokia quarantees that every n900 can handle 600mHz. and you probably don't have money for n900 that is quaranteed to run @900mhz....

the lower the limit, the cheaper the parts are (less reject: cpus that run with 650mhz can be used unlike with 900mhz)

Re: Why does Nokia give us such a low default 600MHz?
 

i dont think it makes that much of a diff. my friends has a samsung moment clocked @ 800 mhz. my phone is waaaay faster than hers and multitasks like a champ. i don't think the over all speed of yoru phone and with specific applications depend entirely on the clock speed.

Re: Why does Nokia give us such a low default 600MHz?
 

Also note that ...
You can guess that they've been speed binned, and that in your hands you have the one that didn't pass the test.

Re: Why does Nokia give us such a low default 600MHz?
 

No, that is not true. Usually, after a little time in tweaking the manufacturing process, all chips that work, work at the highest frequency. It is very likely that none of the 3430 that Nokia got from TI was even tested for 720, it is just as likely that over 99% of those that passes the tests at 600MHz will also pass the tests at 720MHz.