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Thread: HD 4850 Overheating and turning off computer




  1. #11
    Join Date
    Aug 2009
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    Default Re: HD 4850 Overheating and turning off computer

    my card idles at 35c and fan is at 41% at idle i havnt seen it go over 60c at full load i know its not as powerfull as your card but your temps are too high imo,check you gpu fan connections and i would apply some new tmp to the gpu processor,i have a zalman heatsink and fan also and in ati tray i think it still regulates with temps even if you set high fan speed
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  2. #12
    Join Date
    Apr 2009
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    Default Re: HD 4850 Overheating and turning off computer



    Here are the VRM's on the card, left completely bare. Ultimately you would be best to stick some heatsinks to them and then have a fan blow over them somehow. The fan without sinks would be better than nothing, but the heat sinks will increase effective surface area any where between 5 and 10 times that of a bare VRM.

    A total overhaul of cooling sounds good. Remove the Zalman, clean with cleaning fluid/alcohol, do the same to the GPU die. Add fresh compound and spread thinly. re-fix the Zalman, stick on some VRM sinks and have the side fan blowing on to the card. The Zalman fan won't provide any real quantity of air to that end of the card.

    Normal temps for a 4850:

    Stock cooler: 70-75 idle, 85-95+ load.

    Brand specific cooler (Asus Glaciator, Gigabyte's Zalman cooler) 40-50 idle (fan @ 40%) 65-75 load.

    More expensive after market cooler: 30-38c idle, 48-60 load

    All the temps vary by ambient conditions, but the ranges give you an idea.

    The Zalman cooler is completely replaceable. It's not a poor cooler, but not exactly exceptional, merely better than the stock one.
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  3. #13
    Join Date
    Nov 2001
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    60

    Default Re: HD 4850 Overheating and turning off computer

    Would these heatsinks do the trick?

    Newegg.com - Computer Hardware,Fans & Heatsinks,Memory & Chipset Cooling,Mosfet

    The bar heaksinks look like they screw onto the board. The tall ones with tape look like they might work. Of course they are for mosfets instead of vrms but the principle is the same.

    I don't understand why my non-overclocked board would need such tampering just to attain normal operating temperatures of similar HD 4850s. Does the board itself sound defective? Would Gigabyte consider it defective? Wish it was operating as cool as it did 10 months ago.


    .

  4. #14
    Join Date
    Nov 2001
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    60

    Default Re: HD 4850 Overheating and turning off computer

    Solved the problem two days later by turning some case fans around and blowing out absolutely everything in the case.

    Now: idles at 38c, which is generally a sign of a fever. Would you Aussies suggest a Fosters?

  5. #15
    Join Date
    Dec 2008
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    Default Re: HD 4850 Overheating and turning off computer

    Yes Fosters is an Aussie Beer, but dispite popular beliefe the only people that drink it are Poms. lol. I dont even think you can by fosters in my town. We drink XXXX Gold beer here in Queensland. NSW drink Tooheys and Tasmania its Cascade.
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  6. #16
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    Default Re: HD 4850 Overheating and turning off computer

    I can officially confirm that Fosters tastes like sh1t.

    Fosters do make pretty good TV ads though. YouTube - Fosters 'Super Chilled' TV advert "Brewed in the UK, from dead cats and muddy puddles".
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