Underclocking GPU core to less than 500mhz

Discussion in 'Videocards - AMD Radeon' started by Spooonguard, Sep 21, 2010.

  1. Spooonguard

    Spooonguard New Member

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    GPU:
    Sapphire Radeon 4850 1GB
    I've got a Sapphire Radeon 4850, and am using ATT to underclock to 500/794/0.892v from the stock levels.

    This works fine, and power and heat levels drop by 9%.

    However, I'd like to drastically drop the frequency to 50-100mhz for both the GPU and memory.

    Is there any way to override the 500mhz low limit?
     
  2. PhazeDelta1

    PhazeDelta1 Ancient Guru

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    GPU:
    EVGA 1080 FTW
    your card wouldnt function properly. why would you want to do that anyways
     
  3. MerolaC

    MerolaC Ancient Guru

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    GPU:
    MSI 5600XT G. MX
    As Firestorm said. That is way too low.

    My suggestion for core is 150-200
    Memos at 250-300
    Lower will cause bad artifacts

    And the only way I Know to do that is Reflashing the card with a modded bios.
     
  4. superweapons

    superweapons Master Guru

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    GPU:
    XFX GTX 260 Core 216
    The HD 4850 has low-power 2D and 3D profiles. For example, my GTX 260 Core 216 which I have OC'd to a modest 666/1436/1100 (core/shader/VRAM) is automatically downclocked to 300/600/100 when I'm not doing anything moderately intensive such as writing up this post right now.
     

  5. Vood007

    Vood007 Master Guru

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    GPU:
    Too
    You may try to adjust ULPS settings like posted here:
    http://forums.guru3d.com/showthread.php?t=307309

    btw, Fermis go down to 50/135/100 in 2D low power but this must be supported by hardware. I remember my 9600GT did not clock down a lot at all without becoming unusable slow.
     
  6. shimyns

    shimyns Ancient Guru

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    GPU:
    SAPPHIRE r9 290x Tri-X OC
    I used to lower my clocks to 300/300 (core/memory) by modifying a CCC profile XML. Over the past 6 months, drivers won't let me decrease memory to under 500.
    I know that underclocking memory on single 4870's is very limited (there's not even 2d/3d; they just stay at like 900 the whole time) so for your 4850 you'll probably need to flash Bios.
    Anyway, I don't think that with 4xxx cards you can be stable at any less than 300 Mhz.
     
  7. Spooonguard

    Spooonguard New Member

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    GPU:
    Sapphire Radeon 4850 1GB
    Thanks for the replies guys.

    Looks like I can't dynamically change between 200-700mhz, I would have change the bios defaults to a lower value - and then overclock (which still may only be a maximum of 200mhz?).
     
  8. Mda400

    Mda400 Master Guru

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    GPU:
    3080Ti 1950/21.4g
    That is due to the 3.2 billion transistors though. The more tranny's u got (lol), the more stable a frequency can be in all scenario's. As far as i know, i can get my 480 down to .7v at those P12 idle settings. but i dont know about anything lower. still it drops the power current under 10 amps. so that is really good for Fermi.
     
  9. att_user

    att_user Banned

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    GPU:
    Radeon HD 5870 2 GB
    I had the 4870 X2. Lowest i could go with that card was 200 Core / 300 Mem with 0.85V. I made all these settings with Ati Tray Tools because i did not want to flash BIOS. Worked extremly well and did save me about 60% of the desktop/idle power usage.

    You can override the standard clock limits in ATT by clicking on "Tools & Options" then choose "General Options" and go to the "Advanced" Tab and then remove the checkbox "Use overclocking limits" and then click "OK".

    :)
     
    Last edited: Sep 21, 2010
  10. Spooonguard

    Spooonguard New Member

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    GPU:
    Sapphire Radeon 4850 1GB
    Bingo - I can't believe I missed that obvious setting! Many thanks

    Edit:

    Initial results in, I've got down to 250/600. Core temps not changed that much.. 38oC from 40/41oC at the previous low.

    Is there a way to drop the Core V? Or is 0.81 the lowest usable voltage?
     
    Last edited: Sep 22, 2010

  11. att_user

    att_user Banned

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    GPU:
    Radeon HD 5870 2 GB
    You can try and set the clocks lower than 250/600. But changing or lowering the voltage is not possible as far as i know because you canĀ“t change the programming of the voltage regulator.

    There was the possibility to change that with Riva Tuner and a special plugin but it was a very complicated procedure and it was not guaranteed to work on all cards.

    Maybe you take a look in here: http://www.xtremesystems.org/forums/showthread.php?t=217002

    I did not try it on my card because there is always the possiblity that you can kill your card by applying wrong settings to the voltage regulator chip.
     
    Last edited: Sep 22, 2010
  12. sykozis

    sykozis Ancient Guru

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    GPU:
    MSI RX5700
    I had my HD4850 set to downclock to 200/500 in 2D low. I couldn't do it through Catalyst Control Center though. Instead, I created a new profile and manually edited the clocks and voltages within the profile itself. Not long after the HD4800 series cards were released, complete instructions for doing so were posted, but they've since been removed due to time.

    ULPS is for Dual-GPU cards only if you had paid any attention to that thread. Shutting down a GPU, on a single GPU card means shutting down the graphics card completely.

    Also, Fermi information is completely irrelevent in the ATI section.
     

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