What value does my motherboard determine when adjusting the AUTO fan speed?

[tracerit]

I currently have a Pentium D 930 and it idles at 43C and loads at around 55-60C. Problem is that it spikes in temperature instantly from say 45 to 55 causing my fan speed to just increase right away. I reseated my heatsink and applied a new layer of thermal paste hoping the issue would be solved but it's not.

The fan seems to increase from 1200rpm to 1800ish rpm after the temp goes past ~52C.

I plan on getting a new CPU, a E2160 OC'd, E8400, or Q6600. I believe the last two run cooler than the Pentium D that I have. My question is what determines when the fan speed to increase? If those CPUs run cooler at say 30-35C and loads under 50C, the fan speed on my CPU fan might just stay at the low end.

 

[DerwenArtos12]

Originally posted by: tracerit
I currently have a Pentium D 930 and it idles at 43C and loads at around 55-60C. Problem is that it spikes in temperature instantly from say 45 to 55 causing my fan speed to just increase right away. I reseated my heatsink and applied a new layer of thermal paste hoping the issue would be solved but it's not.

The fan seems to increase from 1200rpm to 1800ish rpm after the temp goes past ~52C.

I plan on getting a new CPU, a E2160 OC'd, E8400, or Q6600. I believe the last two run cooler than the Pentium D that I have. My question is what determines when the fan speed to increase? If those CPUs run cooler at say 30-35C and loads under 50C, the fan speed on my CPU fan might just stay at the low end.

Most if not all motherboards detwermine fan speed as a simple percentage. they either use the information build into the processor or information given them from the bios for the highest temperature value alloted to the process then adjusts the fan voltage to an equal percentage. New PWM systems do essentially the same except instead of decreasing the voltage the decrease the number of pulses of electricity the fan gets per second.

 

[Zepper]

Most modern ones use the temp sensors to determine the fan settings. It tries to keep the temps in a "safe" range, not necessarily optimum. You have to go to a separate controller to get optimum temps.

.bh.

 

[zanejohnson]

Originally posted by: Zepper
Most modern ones use the temp sensors to determine the fan settings. It tries to keep the temps in a "safe" range, not necessarily optimum. You have to go to a separate controller to get optimum temps.

.bh.

i have the same chip, really not bad a bad chip, raise the FSB a little, you should be able to get at least 3.6+ out of it, and wouldnt be a bad performer at those clock speeds, about like the earliest c2d's....