Anyone else with a 7800GT with loud fans?

Discussion in 'PowerPC Macs' started by Orizence, Apr 23, 2015.

  1. Orizence macrumors 6502

    Nov 10, 2014
    I recently bought a 7800gt for my dual core G5, but heres the thing... it sounds like a mini tornado in there. I googled about the noise of this card and I have had found conflicting information whether or not there is fan control on this card, because it sounds like the fan is running at full speeds all the time (which is really loud if I haven't said it already).

    Can anyone let me know if this card is suppose to be super loud?
  2. Beavix macrumors 6502a


    Dec 1, 2010
    I have a 7800GS, it's a flashed PC card made by BFG and it's extremely loud.
  3. MagicBoy macrumors 68040


    May 28, 2006
    Manchester, UK
    The 7800 wasn't nicknamed the hair dryer for no reason. ;)
  4. eyoungren macrumors Core


    Aug 31, 2011
    ten-zero-eleven-zero-zero by zero-two
    A Zalman vf700-cu VGA cooler was suggested for the 7800GT in a PC overclocking forum I found in a Google search.

    There is apparently an LED version as well (vf700-cu led).

    Product page:

    Zalman's compatibility page:

    Wasn't looking specifically at prices but one I saw on Amazon was $99.99 and another I saw in the Google search was $35.

    Like most anything, you can probably pick one up cheaper on eBay.

    As a cooler, this would go in place of the current fan.
  5. poiihy macrumors 68020


    Aug 22, 2014
    If the fan is that noisy then it is probably running faster than it should be. Feel the heatsink if it is cold or not. If it is cool then you can lower the speed, but if it is quite warm you might not want to. To slow it down just use a few diodes wired with the fan.

    I strongly do not recommend you replace the entire heatsink and fan unit just to make it quieter. That is a waste.
  6. 128keaton macrumors 68020


    Jan 13, 2013
    Why not? You could get better temps. As it sits, the 7800GT is old, a new heatsink, paste, and fan would certainly help it. I have an 8800 that needs a new fan and heatsink, but since I don't use it I haven't done it yet.
  7. Surrat macrumors 6502


    Jun 20, 2014
    United States
    My G5 quad originally shipped with a 7800gt. I use a quadro fx4500 now, but when I did use the 7800, it never bothered me or seemed excessively loud.

    Is yours an original apple card or is it a flashed pc card?

    Its also possible the heatsink is clogged partially or totally, causing high temps and the cards internal fan control is running the fan high trying to cool it down.
  8. poiihy macrumors 68020


    Aug 22, 2014
    Does the fan gradually speed up after being turned on, or does the fan rev up instantly? If it gradually speeds up then theres probably a temp sensor and it is running too hot causing it to speed up. If it's instant then there is probably not a temp sensor, or maybe there is but it's broken.
  9. Orizence thread starter macrumors 6502

    Nov 10, 2014
    It ramps up as soon as I turn the G5 on. But i cant find any information on whether or not the card is suppose to be so noisy, so I turned here
  10. 128keaton macrumors 68020


    Jan 13, 2013
    Lol I read it as "the fan is trying to be cool".

    "I wish that I could be like the cool cards, cause all the cool cards they seem to fit in (a powermac g5 case)"
  11. California macrumors 68040


    Aug 21, 2004
    I had a PM G5 with one of these cards. Not for long. Too noisy. But there are workarounds and hacks for it... google around.
  12. poiihy macrumors 68020


    Aug 22, 2014
    Touch the heatsink while the GPU is under load and feel if it is hot or not. If it is warm or hot then the fan probably has to run at that speed. If it is cool then the fan is running faster than necessary. Add a diode in series of the fan. Then test. If heatsink is still cool, keep adding diodes until it is quiet enough and cool.

    If you can't get it quiet enough without it running too hot then maybe that heatsink & fan assembly is crap and you should get a new one like eyoungren said. You can find really cheap ones on ebay.

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