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Safe To Run 4 Pin CPU Fan On 3 Pin Connection?

Discussion in 'Overclocking & Cooling' started by DaveK, Apr 10, 2009.

  1. DaveK

    DaveK

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    Hey guys, I have this fat 120mm intake fan from my old Dell, it's 4 pin (PWM?) but wont work on the CPU fan connection...but it does work on the standard 3 pin connection, but I'm not sure it's safe, it's extremely loud and blows a lot of air, it's actually kinda scary lol

    lol http://www.youtube.com/watch?v=4FCFpS4k75c
     
  2. SparkyJJO

    SparkyJJO New Member

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    What are the current ratings on it?

    It is probably fine.
     
  3. r9

    r9

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    yes
     
  4. DaveK

    DaveK

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    12v, 1.30a.
     
  5. Chloe New Member

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    no, don't ever push more than 0.7a through a motherboard fan header, hook the fan directly to yer psu. otherwise it'll overload the motherboard voltage regulators.
     
  6. mlee49

    mlee49

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    youtube video has been removed... :(

    You'll be fine by running a 4 pin fan in a 3 pin slot. The last pin is for fan control and will just go unsupported. If you want to quite the fan down you may be interested in a molex modification to drop the voltage to 5V and then get an open pin adapter. That would require about 30 minutes of work/modding and about $5 for the open pin adapter, but would be a nice beginner's project.
    I suggest dumping the old thing and just get a nice, brand new, Sycthe S-Flex or the likes. :) $15 at Microcenter/Newegg. Ensured life span, super quite, and well worth the money.
     
  7. chuck216

    chuck216

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    It should be fine I'm running a 120mm x 38mm 1.5 amp fan out of a Dell 1600sc server off of one of the 3 pin headers, as my side panel fan it works fine. nothing like 160 cfm for case ventilation.
     
  8. silkstone

    silkstone

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    If in doubt you can get a fan hub. I just bought a Cooler Master Wind Rider. It has 6 PWM fan headers and cost me $15. It worked out a lot better than modding all my fans to fit.
     

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