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Thread: Change fan speed of Radeon HD 4850?

  1. #1
    Join Date
    Jun 2008
    Posts
    64

    Default Change fan speed of Radeon HD 4850?

    Can one change the fan speed of the HD 4850 in Linux?

  2. #2
    Join Date
    Mar 2008
    Posts
    7

    Default

    I, too, am interested in the same thing.

  3. #3
    Join Date
    Jun 2008
    Posts
    64

    Default

    Quote Originally Posted by Keefa View Post
    I, too, am interested in the same thing.
    As I understand you need to use windows tools to flash the BIOS. In windows you can also set the fan speed with in an xml config file, but I don't see that there is any program nor driver for this in Linux. So best solution is to get the card flashed with recommended fan settings.

  4. #4
    Join Date
    Nov 2007
    Posts
    65

    Default

    After beeing annoyed for a while because of changing fan speeds on my HD4870, I've modified the video bios to allow quieter operation.

    My card is a MSI R4870-T2D512-OC, originally at 780/1000MHz.

    The Windows tools I used was:
    GPU-Z, for extracting the bios from the card)
    (ATI)WinFlash, for flashing.
    Radeon Bios Editor (RBE), for changing the frequency and fan controls in the BIOS files.

    The things I changed was frequencies down to 750/900MHz, lowered voltages when in powersaving modes, increased voltages when in performance modes (card was unstable at stock voltage and memory speed of 1000MHz, the cards were later altered to ship at 780/900MHz), altered fan to kick in a bit higher (40C/106C), enabled PWM and set hysteresis to 10%.

    All this made the card a bit cooler, and the fan finally runs stable on low speed while in powersave (2D) mode.

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