guys.. it is dangerous to our n900 that we always turn to overclock?? because some patch here was set to overclock.. just a question..

sure is, it might blow up and kill everyone within a 10 mile radius!

BEWARE!

Most likely no negative effects. Just don't use it overclocked on a packed bus, just to be on the safe side :P

Lol what are you overclocking? a phone a PC or a nuclear guided missile with an arm chip used for running the guidance device?

Yes it is, but only for your phone.
You can frie your processor, or not =)
Depends on how you do it, and depends on your phone too.
See my case, i never had a problem with overclock (not mentioning crashes and freezes, but it doesnt happen everytime).
Newer Power Kernels are very stable and crashes decreased significantly (bit this is MY case).
Some phones never run well with overclock, other ones even stock...
My phone is overclocked almost since i have it (about 1,5 year ago) and today it´s better than ever, with CPU Speed and Battery tweaks.
By default, it starts with 805Mhz, but when i want more, is too easy to change to 1000Mhz for a while.
So, i say you can try overclock, but pay attention on the tutorials and read carefully. Make each procedure as it says. And at every different behavior you notice, let the community know.
But, it is YOUR resposability. Do if you want to.

=)

sir what on the safe side???

sir what on the safe side??? someone says it not safe when you overclocked when not in use but in battery patch it sleep when idle..

Was meant to be a joke. Anyway N900 has by default 2 frequencies one minimum(125 MHz) and one maximum(600 MHz). When idle it would automatically take minimum and when it is in use it will jump up and down between minimum and maximum on demand. By changing the maximum from 600 to a higher value the minimum(idle) value doesn't have to change(though some people prefer it also higher so that device is more responsive in an event of something like a phone call). I don't use battery patch so I don't know what effect overclocking would cause there, but if the author of the patch stated that overclocking may cause problem when N900 is idle it would be wise of you to leave the min frequency alone. You should probably ask in the respected thread about the effects and also ask about changing voltage profiles(ulv, xlv, lv) normally you'd opt for the lowest that is stable on your device, but then again you should ask that on the other thread.

You can't fry your CPU in the N900 even if you overclock. Well, you will probably be the first in the world maybe if it happens. This is because most modern CPUs have safety features built in. N900 will also freeze up and stop responding well before the CPU goes into some kind of melt down temperature etc. As long as you don't over-volt the CPU, it is pretty much impossible to physically damage your N900 no matter what you do in relation to frequency limit changing. The custom kernel for the N900 provides the option to under-volt but not over-volt anyways. So you are safe there. =P

Anyways, if I had to answer your question now...
No, it's not dangerous to overclock the N900.

Also, power kernel has many security measures to ensure that it is.
(e.g. It loads default value upon an unexpected "non-clean" reboot)

I have been using qCPUfreq for 2 months now in combination with kernel power48 and i keep the frequency at a permanent 900 MHz, although the device switches back to 250 MHz for most tasks (90% of the time). I had no strange reboots/freezes after intensive use for 10 days