I recently upgrade my stock cpu fan with an Arctic Cooling Freezer 7 Pro ( http://www.arctic-cooling.com/catalog/product_info.php?cPath=1_42&mID=72) and two case fans Arctic Fan 9 PWM ( http://www.arctic-cooling.com/catalog/product_info.php?cPath=3_47_65&mID=109 ). The behavior of the mainboard is a little bit strange to me so I will describe it here in case anyone has more information to bring some light into this.
As you can see on the Arctic Cooling website you can daisy chain those fans which I did. The result was the fans were running pretty quiet and the fan speed was reported around 650 RPM. I tried to put some load on the system (prime95) and the cpu temeprature went up but the fans were still spinning at the same rate. No matter what I tried in terms of load I couldn't make them spin faster. The core temperature reported was around 60 C (using CoreTemp utility). I'm not sure if this a normal behavior or not on this mainboard. On the older boards I used the speed of fans was increasing with the load. Then I tried something else. I left on the CPU fan socket connected only the Freezer 7 Pro and connect the other two PWM fans on the 3 pins headers from the mainboard (front & rear ). The result was the CPU fan is running now around 900 RPM and sits there no matter what load I add to it. The core temperature is the same , around 60C. The interesting thing happened with the case fans which now are spinning between 900 - 1700 RPM and changing the speed every 1 or 2 seconds. So basically they spin up and then down every second or two which is annoying and generate a lot of noise too. Do you think there is an incompatibility of some sort between those fans and the mainboard ? They are brand new and I test them on a different system (Asus mainboard) and they perform normal there. Also I went into BIOS and I was playing with the Fan Control settings which for me didn't change anything as far as I can see in the reporting fan speeds . I went also into the Maintenance mode of BIOS and enable "Unlock QST" feature but without any visible changes to me. Then I tried to disable the QST from the AMT menus but this didn't work at all. I tried couple of times and it seems to be consistent : as soon as I change the QST setting into Disabled and the system restarts the fans are start spinning at full speed, and the system doesn't post anymore. The only way to bring it back to life is to reset the CMOS by removing the battery. Anyone else notice this ?
I'm running the latest BIOS from Jan 22 I think on the board and the CPU I have is a Q9650.
Thanks for any hint you might have !