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D865GLC + CPU Fan Speed HELP
I have an Intel D865GLC mobo that has a std retail boxed with std Intel fan
P4/2.6 800 FSB CPU with 2x DDR400 256MB for dual channel and hyperthreading and all enabled. I've flashed the latest P11 BIOS but the behavior described below was the same for P09. No matter what the CPU fan speed is 2720-2840 RPM. The BIOS setup is set for CPU fan speed control and both low speed off and slow have been tried. I just got through cooling the system to where the CPU temp showed 13C(open window[glass kind]) and RPM~2750. I've tried both inside BIOS setup and in XP Home in Intel Active Monitor. The CPU fan runs at about 2740 no matter what. Sometimes the fan stops when the system enters standby. Normally the CPU temp is about 30C and RPM~2740. I moved the CPU fan to mobo header zone 2 and at low temp the fan was stopped and at ~30C it was ~1300RPM and 1800 at 40C again both in BIOS setup and XP Intel Active Monitor. I'm guessing that the max RPM is ~2840. What is the normal fan speed/RPM range for one of the std Intel CPU fans with the 3 pin connector plugged to the mobo's 3 pin "Processor fan" header(H)? What controls CPU fan speed: mobo hardware, mobo BIOS or some SW under XP? Where's the likely problem and what do I try/where do I go next? Are they any Intel NGs providing help these days as there used to be? |
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Ron Reaugh wrote:
I have an Intel D865GLC mobo that has a std retail boxed with std Intel fan P4/2.6 800 FSB CPU with 2x DDR400 256MB for dual channel and hyperthreading and all enabled. I've flashed the latest P11 BIOS but the behavior described below was the same for P09. No matter what the CPU fan speed is 2720-2840 RPM. The BIOS setup is set for CPU fan speed control and both low speed off and slow have been tried. I just got through cooling the system to where the CPU temp showed 13C(open window[glass kind]) and RPM~2750. I've tried both inside BIOS setup and in XP Home in Intel Active Monitor. The CPU fan runs at about 2740 no matter what. Sometimes the fan stops when the system enters standby. Normally the CPU temp is about 30C and RPM~2740. I moved the CPU fan to mobo header zone 2 and at low temp the fan was stopped and at ~30C it was ~1300RPM and 1800 at 40C again both in BIOS setup and XP Intel Active Monitor. I'm guessing that the max RPM is ~2840. What is the normal fan speed/RPM range for one of the std Intel CPU fans with the 3 pin connector plugged to the mobo's 3 pin "Processor fan" header(H)? What controls CPU fan speed: mobo hardware, mobo BIOS or some SW under XP? Where's the likely problem and what do I try/where do I go next? Are they any Intel NGs providing help these days as there used to be? Hi Ron, I've got Intel's 865PERL, 2.8gHz P4 and stock CPU cooler. It behaves just like yours ... although I haven't tried the open-window test!! The noisy h/s fan drives me crazy. http://www.silentpcreview.com reviewed Intel's heat sink. They say the fan speed is controlled by a thermistor built into the fan itself, suggesting that the CPU fan power header supplies 12v regardless of temperature. Your experiment with the zone 2 header seems like a good solution - my GUESS is that the BIOS is controlling output voltage to that header, but it might be XP. I think I'll give it a try. I'm running multiboot - Linux/Win2k Win98/DOS so I'll know soon enough if the o/s is controlling zone 2. What is not clear is whether moving the fan tachometer signal from one header to another compromises overtemp protection (if any). Leaving the h s fan connected to its intended header and putting a resistor in series with the +12v lead might be safer. Something around 25-50 ohms @ 2 watts seems right. Roby |
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