Reliable CPU fan speed controller?
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From: JD on 9 Nov 2009 14:09 JD wrote: > Paul wrote: >> JD wrote: >>> >>> I forgot to mention that the case fan is connected to the power supply >>> and has only 2 wires and is probably not compatible with the board >>> connection. >>> I guess I should look for a 3 wire fan of the same size and connect >>> it to the >>> motherboard.. >> >> You can connect the two wire case fan to the fan header. It would still >> get power. The only issue with a connection to the motherboard header, >> is if the fan draws a lot of current. There are a few pre-built >> computers, where a fan drawing one ampere is used, and that is >> too much for a regular fan header. The motherboard manual sometimes >> tells us the current flow limitations of a header, and so that is >> something to keep in mind. If the case cooling fan draws somewhere >> between 12V @ 100mA and 12V @ 350mA, that might be safe to connect >> to the header. > > Is this oddball name "fan header" the fan connection point to the > motherboard? > >> Check what is printed on the hub of the fan. The label sometimes >> includes power in watts or current in milliamps, from which you >> can decide whether the fan really should stay connected >> directly to the power supply. > > Yes, I think I'm in luck. The rating is 12v, 0.15A. > >> I have one large fan here, on another computer, and it draws close >> to 1000mA (1 amp). I have it connected directly to the power supply. >> I don't think the motherboard on that computer, could handle it. > > Phew!That's quite a fan. > >> A 2 wire fan cannot be monitored for RPMs (at least the normal way >> via an RPM signal). But you could still vary the voltage to the >> fan, if the motherboard has control capabilities on that particular >> fan header. > > I'll look for a connector for that fan. > >> Paul > > Thanks again :-) It appears that SpeedFan does NOT work with my motherboard. Speed changes can be attempted on SpeedFan but they do nothing and my CPU fan is still running at about 4,300 rpm. The BIOS has a variable setting for the fan or fans but it seems to be dead too.
From: kony on 9 Nov 2009 17:37
On Mon, 09 Nov 2009 11:09:19 -0800, JD <JD(a)NoDen.con> wrote: >> Yes, I think I'm in luck. The rating is 12v, 0.15A. >> >It appears that SpeedFan does NOT work with my motherboard. Speed >changes can be attempted on SpeedFan but they do nothing and my CPU >fan is still running at about 4,300 rpm. The BIOS has a variable >setting >for the fan or fans but it seems to be dead too. Personally, I'd just solder a 2W, 68 Ohm resistor in series with the power lead... 68 Ohm being best guesstimation of what you'd need to hit 2000-3000 RPM with fans of similar ratings to the above, though there are ready-made fan controllers that would allow ramping RPM back up in warmer weather. |