PWM throttle hack
photo love story |
background on pwm fans
The other day I bought this shiny new mainbord, a CPU and a CPU fan, which
support cool and quiet and what happens?
Right: It Don't Work!
The cpufan howls like a storm once the bios kicks in.
This feature is called "CPU Quiet Fan".
In order to fix this I disabled the feature in the bios so the fan
runs at maximum speed.
Then I hijacked the pulse line and fed this and a 5V line from a power
cable to the fan and TADA: silence.
The initial setup:
left: the cpu fan cable
right: an audiocable I connected to the mainboards cpu fan socket
top: a power cable - the red one has 5V, the black ones are ground and
the yellow one has 12V
I used tinker wire because I had nothing else at hand..
Nicely packaged with insulating tape =)
I am not responsible for any damages blah blah.. think before you act
and don't bug me if it breaks.
The bios doesn't recognize the fanspeed anymore - I suspect it is
because it expects a 12V signal. In my setup I just left that pin
empty to avoid possible trouble.
http://www.hardwarebook.info/4-wire_PWM_Fans Description of the PWM Socket