Per Jessen wrote:
David C. Rankin wrote:
Listmates,
I have a relatively new 11.0 box with a phenom 9850 that is fairly quiet. Recently I noticed the CPU fan noise quite a bit more than usual. I initially thought that fan control was going on the fritz. I checked the temps and fan speed with lm-sensors and confirmed fan RPM was pegged near max:
CPU Fan: 5338 RPM CPU Temp: +33.0°C
That's quite a lot of RPMs for that temperature.
completely vanished. The box was for all practical purposes near silent. I checked the temps again:
CPU Fan: 3282 RPM CPU Temp: +31.0°C
Far more reasonable.
That is absolutely incredible. Evidently the fan thermostat on the stock AMD cooler that comes with the processor has less than a 2 degree spread between its 3200 RPM low noise state and its 5200 RPM annoying as hell state.
David, the fan speed regulation is not done by the fan itself, but by software. The temperatures are measured, and the results fed back to the PWM regulator on the motherboard.
After my experiments with the Gigabyte board in Feb/Mar, I haven't looked at measuring fan speed and temperatures - my MSI board has a new sensor device, for which my kernel doesn't have a module.
/Per
Per, This is on a MSI K9N2 board. How do I tell what it uses (module, etc.) to feedback the temp information? Also, this has an AMI BIOS that has a new feature located in the H/W MONITOR bios page that I haven't played with yet. It is CPU SMART FAN TARGET that looks like it allows me to specify the CPU target temperature or [40 45 50 55] degrees. I presume that this will affect the feedback or gain on the fan control. The manual says: CPU Smart FAN Target The mainboard provides the Smart Fan function which can control the CPU fan speed automatically depending on the current temperature to keep it with in a specific range. You can select a fan target value here. If the current CPU fan temperature reaches to the target value, the smart fan function will be activated. It provides several sections to speed up for cooling down automatically. Looks promising. It is currently disabled, but when I get some time, I'll give it a go. Set it to control at 45 and let the current temp float a little higher under minimal CPU fan and see if it doesn't eliminate even more noise. -- David C. Rankin, J.D., P.E. Rankin Law Firm, PLLC 510 Ochiltree Street Nacogdoches, Texas 75961 Telephone: (936) 715-9333 Facsimile: (936) 715-9339 www.rankinlawfirm.com -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org