On Sun, Jun 10, 2007 at 11:35:28AM +0100, Phil Endecott wrote: > My 1.2GHz board is fanless, i.e. it has a passive CPU heatsink, and all > three of the fan connectors are non-controllable. However the board > has unpopulated positions for control components for the CPU fan, and > my guess was that they are fitted on the 1.5GHz+ versions (which ship > with a CPU fan, as I presume yours does). So you should be able to > control the speed of your CPU fan. No Dice. I set 0x60 to 0x22 (Fan #1 - Manual Mode) and 0x6b to 0x01 (lowest PWM setting) and did not see any change in the fan speed. > I would be most interested to know whether you get reliable fan speed > readings when the CPU fan is not set to full speed, so if you could > possibly check this before you return your board I would be very grateful. Since I can't affect any change, I can't test this one for you excpet by dragging my finger on the fan :-) Any other tests I'll be happy to try in the next day or so before I return the board. > One possibility would be to connect your case fan in parallel with the > CPU fan, allowing both to be controlled together. Thought about this if fan control would work on #1 and if the motherboard could source enough current. > You could also use a quieter, lower-volumne fan, or reduce the voltage > to your existing one; one common idea is to wire it between +5 and +12 > so that it runs at 7v. You can even buy inline cables for voltage > reduction. I'm not fond of using the +5 as a ground on the +12 leg. I'ld rather have the full control. > But are you sure that you need a case fan? I have built a number of > things with mini-ITX boards and none have had any fans at all, until my > present 1U project. What sort of power supply are you using? I have a 500G 3.5" SATA drive and a Win-TV (happauge) PVR-350 card in there... both of which make a lot of heat. Inside the mini-itx case it just gets too hot to not have a fan -- I'm worried about the long-term reliability of both items if they sit at 50-60C all the time. the case was physically hot to the touch w/out the case fan. Does anyone have any success stories for another Mini-ITX motherboard about having working fan control? Epia? MSI Fuzzy? Cheers, -m
