need to control CPU fan speed

Soldato
Joined
6 Feb 2004
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20,876
Location
England
the sensor on my p35-ds3l motherboard has given up (2 different CPUs and fans say it must be the mobo) and the fan constantly runs at the lowest speed no matter how hot the CPU gets. this wasn't a problem with my old E5200 because it used to idle around 45 and maxed around 75 when under artificial load such as OCCT. whilst not great, it was perfectly acceptable.

but i now have a Q6600 and it can idle in the 70s. i tried using speedfan to speed up the fan but i couldn't get that to work. so next i found an option in the bios to make it run full speed and it's now idling at a more respectable 35c. that's nice and cool but the obvious problem is the noise it makes. and i doubt it's good for the fan running 100% all the time either.

my next step was to think of getting a fan controller so i bought a zalman fan mate 2 without even bothering to check the connections. it's for 3 pin fans but i have a 4 pin fan. :o

i'm looking at what i can do next for as little money as possible. googling for 3pin to 4pin adapters only finds molex things. is there another cheap fan controller i can buy for 4 pin fans? help. :p
 
I might be wrong but I think the 4pin pwm will plug into the standard 3pin just leaving the pwm pin unused. The fan controller should be voltage regulated so should still work with the 4pin fan.
 
I might be wrong but I think the 4pin pwm will plug into the standard 3pin just leaving the pwm pin unused. The fan controller should be voltage regulated so should still work with the 4pin fan.

^This. Just plug it in as normal and it will work fine. The 4th pin is just for the PWM bit, which you dont need as you got a fan controller.
 
i had to butcher the plastic connection on the fan mate to get the 4 pin adapter from the fan to fit but it works. for the other end, i have a spare 3 pin header on the mobo so i connected that up and it's all good.

just turning down the fan from 2700rpm to 1500 has made a huge difference noise wise but my idle temps are still the same. now for some stress testing.... :p

when left to the motherboard to control it, it ran at 470rpm no matter what - no wonder it got a bit warm.

thanks guys. :)
 
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i did try pushing it some more when i had the fan on max for a few days but i decided the extra 0.1v/+10c temps for an extra 200mhz clock speed just isn't worth it. i'm happy enough with it as it is. :o
 
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