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Sapphire HD4850 toxic fan-control

Discussion in 'AMD / ATI' started by j4cky333, Aug 24, 2008.

  1. j4cky333 New Member

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    Hey,

    I have got a Sapphire HD4850 toxic and its fan (zalman vf-900-cu) is always spinning with the same speed (independant of temperature or clock). It is very noisy. As a result I flashed the bios (RBE and winflash) of that graphic card with different fan settings. For example I set "Tmin" to 60°C and "Duty cycle min" to 0. I tried several settings but the fan speed didn't change after flashing.
    It runs always with about 1800rpm. I don't know where my mistake is or if it is even possible to reduce the fanspeed of that card with a bios flash.
    On request I can post some further information and pictures.

    I am thankful about every help.
     
  2. boogah New Member

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    duty cycle min to 40
    T min to 45

    make sure you have pwm ramp checked on the bottom

    It will run at 40% until it hits 45 then ramp up n down depending on temperature from there.
     
  3. tigger

    tigger I'm the only one

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    I changed the fan on my vf900-cu to an 80mm akasa amber,much quieter.
     
  4. herve New Member

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    Hi,

    I did the setup according boogah advises, but it does'nt work. Fan is still runnig at 1800rpms
    Is there anyone to help me ?
    thanks
     

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  5. Psyon New Member

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    I guess u didn't read the techpowerup review about the toxic card, did you?

    http://www.techpowerup.com/reviews/Sapphire/HD_4850_Toxic/25.html
    You will not be able to control the rpm with bios or software. The only way to control it is to use fan controls like zalmans fan mate. For me its the main reason I don't buy the toxic card. Even though its overclocking capability is great.
     
  6. herve New Member

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    Unfortunately for me, your right, I didn't read it...
    If I had thought, I would not buy it..
    hopfully I have one zalman fan mate....

    thanks for your reply.
     
  7. DonInKansas

    DonInKansas

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    I presonally always ran my Zalman at 100%...It's so quiet I saw no reason not to.
     

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