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Question about retail P4 fan

K

kidtriton

Member
I just put together a intel D845PEBT2 board and retail 2.4 northwood. The intel active monitor shows my cpu fan speed always in the 2200rpm range. The way i thought it was supposed to work was if the ambient temp in the case started to rise, the fan itself would increase its speed up to around 5000 rpm. My system idles around 30C cpu and 30C case, but i have run it up to over 50C cpu and 45C case doing some mpeg encoding, and the fan still stayed at 2200 rpm. I know the active monitor is working because i stopped the fan with my hand and it read 0.
 
Yes thats an interesting obversation, I noticed the same thing when I was using the retail p4 HSF, I did not notice the rpm's changing at all on the fan. Perhaps there is something that we're missing here, someone with knowledge please help!!
 
Does it have a jumper or something like that to set the Fan to do this? On my Volcano 9 I have to change jumper settings, then enable this function in PC Probe for the temps to be monitered. Might be something like that? Or can you set the temp levels in your BIOS?
 
I thought it only goes higher as the temps get way up there ~50'c or so?
There was also a hack for the retail fans to make them stay on the higher speed setting all the time
 
No, its not anything controlled by the bios or motherboard. The way i understand it is the fan itself gets the 12v input all the time, and it has a thermistor in the fan itself that is supposed to regulate the speed, and that speed is just reported back to the Mb through the 3rd wire like any other fan. Thats why its supposed to speed up with higher case temps, not cpu temps. It doesnt hurt my feelings one bit that its running slow (2200), as i got it bacause i couldnt stand my loud athlon XPs anymore, and could never get them as quiet as i wanted. But my cousin said he built some P4s and they were in a very cool room and the fan would actually not be turning at all at times. It just seems like my fan never changes speed in the 3 days ive had it now.
 
Well I've been running a 1.6 Northy at 2.2GHz for about 9 months now, and I've never seen the fan go below 2200 RPMs or above 2700RMPs, FWIW.

Kramer
 
The stock Intel fan is temperature controlled, but it seems that it is not very accurate. It is supposed to speed up when the temp goes up, like you said. But for most people it stays around 2200 PRM.

I can't remeber where it was, but I was looking at a fan roundup and they mentioned this "problem" with the stock Intel HSF. In fact, they had a 60 watt light bulb, and put it directly on top of the fan, and sure enough, the fan sped up, stopping around 5,000 RPM as I recall.

I am not sure why Intel has not fixed the problem, but the fan does a decent job as it is, so maybe it just isn't worth fixing.

I'll post the link to that fan roundup if I can find it again.
 
Originally posted by: kidtriton
anyone else?
Click to expand...

Hi there,

I just bought the same board and have identical cpu with retail HS/F ... I noticed there is an item in the BIOS which controls the CPU fan speed; I can't access it right now (have the system busy - will check it out after reboot), but I looked in the manual and it's not mentioned there.. My board came with BIOS P02 or P03, can't recall, and I flashed it to the latest I think P06 - but remember the fan control was there already before flashing.

My temperatures are around 34 CPU idle and 30 system (room around 21) , with fast warmup on CPU activity (didn't check the peak yet); but I noticed as well that the fan will keep spinning around 2200 rpm.. I used Antec termal pad to replace material on the heatink, since I had it installed on the different board before.

dave

...ok, I rebooted and checked that out:

it's under advanced/fan control configuration; my BIOS is P06
 
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