How to increase CPU Fan Speed

By speedy266 ยท 12 replies
Feb 2, 2005
  1. Most people talk about there CPU fans being to loud and that they wanna know how to decrease their speed because theyd rather have peace and quiet and have there CPU take some heat. Well i have speedfan and my cpu fan rpm sits around 3400rpm, ive seen it get into the 5000rpm ranges. How would i go about having full control of my cpu fan? I wanna have it running at maximum speed all the time, i wanna bring my cpu temps below 40C at idle.
  2. Nodsu

    Nodsu TS Rookie Posts: 5,837   +6

    It depends on the type of fan you have.

    Some of them alter their own speed according to the temperature, some of them have their speed adjusted by the motherboard.

    How many wires run into your fan? If it's three wires then there is no way to control its speed. If it's four wires then connecting the speed control wire to +5V should do the trick.
  3. speedy266

    speedy266 TS Rookie Topic Starter Posts: 23

    i got 3 wires, green yellow black. im thinging there is a way of tricking it into thinking that the temp is really hot but really its not, that way the fan will spin to compensate???
  4. Dcrewchief

    Dcrewchief TS Rookie

    fan speed

    only way i know is to unplug fan from board and adapt to 4 pin and run straight from power supply.
  5. speedy266

    speedy266 TS Rookie Topic Starter Posts: 23

    Alright, the yellow is 12V+ Black is 12V- and the Green im guessing is the sensor for the rpms? In that case id just splice into the yellow and directly connect it to one of my 4 pin connectors? That way it still reads rpm speeds?
  6. Watching over Gotham City...hey it's dark out here

    Try this

    Simply plug your CPU fan plug into one of your
    systen fan plugs on your board and
    on some board resulting into your board thinking it's
    a standard system fan and therefor running it at
    full speed

    it's worth a shot
  7. Masque

    Masque TechSpot Chancellor Posts: 1,058

    Trouble with that is the system board will not see a CPU fan and error with beep codes on bootup.
  8. speedy266

    speedy266 TS Rookie Topic Starter Posts: 23

    Ive tryed that, I pluged my cpu fan into the the 2 other slots and it stills gives the same speed, also my computer can boot up without the cpu fan. Next im gonna try Asus Probe program i think there might be some setting in there hopefully to control it.
  9. Justin

    Justin TS Rookie Posts: 942

    Check to see if "Smart Q-Control" or "Q-Control" is enabled in BIOS. Contrary to popular (nodsu) belief, fan speed can be controlled on 3-wire fans. Fancier motherboards (Intel D865GBFL, ASUS A7N8X-E, etc) do this by throttling voltage. If it is enabled, try disabling it, or setting max fan speed to a low temperature.

    What cpu is this, and what heatsink/fan are you using?
  10. speedy266

    speedy266 TS Rookie Topic Starter Posts: 23

    Its one of the first Pentium 4 motherboards.

    Asus P4T socket 423 stock heatsink and stock intel fan. I dont believe i have that option in my bios but i'll check next time.
  11. chamillitarysk8

    chamillitarysk8 TS Booster Posts: 128

    i have a inspiron 1150 and i want to know if i can increase the fan speed
  12. Tedster

    Tedster Techspot old timer..... Posts: 6,002   +15

    if your BIOS allows you to change the fan speed, then do it there. otherwise leave it alone. Generally it isn't a wise idea to mess with cooling. Results can be disastrous.
  13. spoty4

    spoty4 TS Rookie

    chamillitarysk8, there is a program called dell precision fan controll.
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