Does P4 really heat up instantly?

[anandfan]

I have my first P4 (2533) system up and running. I'm surprised that it runs as hot as or hotter than my Athlon (2400+). I have MBM installed on both machines. On the Athlon, when turned on from a cold start (sitting overnight), the Athlon CPU temp starts out at room temp (23C here) and then rises to 40C over a few minutes. The P4, when turned on from a cold start, starts out at 40C and rises up to 50C. Why does the P4 seem to heat up so much quicker than the Athlon? Perhaps the Athlon temp is coming from a sensor below the CPU while the P4 sensor is located inside the CPU? Even so, I would expect the CPU to heat up slower.

FWIW: The Athlon has an aftermarket HS, forgot the name, with a Panasonic L1A fan, bolted to the mb (Asus A7v266c) and uses Artic Silver.

The P4 has retail stock HSF, attached with the stock black thermal pad (Abit IT7 Max2 Ver2). Might replace this with a Zalman 7000.

Not having any particular problems. Just curious.

 

[Mingon]

Sounds like your heatsink is not working well, I am guessing it has an aluminium base?

 

[Mikewarrior2]

its a direct problem with reading a socket-thersmitor versus an internal diode... Socket-thermistors transition much slower... measure changes much more slowly, etc.

Plus, you have a better heatsink on the amd... another, but less significant, reason that you can't compare the temps.


Mike

 

[anandfan]

I am guessing it has an aluminium base?

Looks like steel! Whatever the Intel retail HSF is...

 

[MrThompson]

You realize the diode on a P4 is not in the hottest part of the chip. Have a look here.

 

[hmsrolst]

I have had dozens of P3 and several P4 systems and none have displayed what you describe, i.e., they gradually warm up over 5-15 minutes. If the 50C is at idle, I think you have a cooling issue of some kind. You should be able to do better, even with the stock HSF. However, if it's a full load, e.g., video encoding, that's a pretty reasonable number.