Precision M6300 overheat

I recently upgraded to Core 2 Duo X9000... the temperatures went up (as expected, if compared to the previously used T7700).

I was pretty confident this particular laptop is able to handle this... laid fracking $3000 back then... It really annoys me how it just shuts itself off now during work, where you, Dell, are supposed to help me get the bucks with this awesome tool. Yes, such useless things like games run fine and it never shuts down. I will explain further.

So, I ran a temperature monitor, and I think I see the problem... The readings labeled "THM" go up to 105 degrees Celsius during short multitasking system load spikes. In these particularly short and intensive spikes, the fans kick in waaay too late and lower their speeds too often in some false system load drop anticipation (for laughable half a second... what the?). Due to this, sometimes THM temp overshoots 105C shutoff threshold (from what I've read at Intel, that should be "the limit" for motherboard and CPU, and THM is the motherboard, I presume?). Anyway, I've never seen THM go higher than 105C and the max reading is always at 105C, so the overheat is rather conclusive. THM temperature varies like crazy. From 60 to 105 in just few seconds and drops back to 50 in same eyeblink.

This never happens, when the fans are always running at high speed. Aka, if the system load is constant, it never shuts off, so the Dell resource CD tests are useless, since they never test for varying multithreaded load.

Dust cleaned and fans checked.

Idle temps are: THM: 52C, CPU 46C, GPU 72C

Maybe Dell can patch this up in the BIOS? Or can the fan speed adjustments be made less susceptive to temperature drops and more aggressive against rising temperature... ? This issue just feels so trivial.