as long as your processor isn't like allready 70c+ I would say it is safe to try...
Hi, I'd say the answer is a bit more complex than that... some additional things you can do :
1. Check your processor thermal specs and verify *how* you are measuring temps. For instance, Pentium-M's have the thermal critical point at around 89ºC (for throttling) and switch off at around 93ºC, being rock solid normally up to this high temps.... as long as you measure with the real internal thermistor thing. P4s on the other hand do not seem like being so much 'heat resistant' and throttle down before than that.
2. Check your *current* temps. You have to assume they are safe as per manufacturer design (I know, there are exceptions,... but generally), so if you can overclock an make sure your temps are no higher than that then you are in any case *improving* your temps and reducing the risk. To achieve this you can go two ways :
a) Improve your processor thermal dissipation by using a better HS/Fan through modding, or by using a better Thermal Interface material (ASII,..)
b) Decrease voltage to your processor (also do not forget to prime). You can do this to most mobile CPUs with Rightmark CPU clock utility... but beware.. if you're later overclocking you *may* have to go up voltage also,... so it's in fact a matter of finding the right combination of speed/voltage.