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GPU cooling in sli/xfire configurations

Discussion in 'Video Cards & Monitors' started by dcl, Jun 11, 2010.

  1. dcl

    dcl Member

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    Hey guys,

    I'm wondering how the stock cooling solutions work on modern high end cards. With a second card installed, you're blocking the fan and this decreasing airflow.

    Or is the idea the card sucks air from the front of the card?
    [​IMG]

    How are temps affected when using 2 or so cards?
     
  2. raybies

    raybies Member

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    Well mine are f'ing hot look:
    [​IMG]

    idle around 64c max 92c after 1 minute I made the mistake of getting 2 cards of the same type because they're supposed to offer better cooling over stock... AND the real mistake was I thought I could put 1 card in slot and 1 in slot 3.

    [​IMG]
     
  3. Bonesaw

    Bonesaw (Banned or Deleted)

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    Well you are stress testing the card, its not exactly 'gaming'

    Just ramp up the fan rates if your worried about it, most GPU's can handle 100+C with ease.
     
  4. Frontl1ne

    Frontl1ne Member

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    I wouldn't say with ease... My 4870X2, for reasons I won't go into, had to sustain temps of ~114 degrees on its VRMs (max temp for VRMs is 125) for a while, started artifacting after two weeks or so.

    IMO, a card with it's GPU running at 100 degrees under load won't last long.
     
  5. tek_01

    tek_01 Member

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    raybies what cards are they? pcs+ ?

    edit: read your sig, dont mind me :/
     
  6. snappy1

    snappy1 Member

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    It really depends what case cooling you have, I ran 2 4870x2's in CFX for over a year, after I added a 120mm case fan in the right spot they never saw over 70 deg c, gaming and benching at 830mhz core. X2's are hot cards
     
  7. raybies

    raybies Member

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    Yes the top 1 is a PowerColor PCS+ 5870, the bottom a Sapphire Vapor-X 5870.
    An hour after my 1st post I put a 12cm fan on the side of the case and the card progressively went up from ~55-78c after ~10mins

    @snappy1: holly crap 5970x3? What games u playing? Res? What's your power bill like?
     
    Last edited: Jun 11, 2010
  8. miicah

    miicah Member

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    VRM temps were always terrible with HD4xxx cards, many manufacturers completely forgot about how their cooling solutions would affect these temps. Mine are pretty bad as well. But each GPU is designed to run at diff temps
     
  9. Alba

    Alba Member

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    You can't run 3 x 5970 as they are dual GPU and the OS only supports 4 GPU's in any combo.

    His sig is a typo, he has 1 x 5970 and 1 x 5870.
     
  10. n3wbi379

    n3wbi379 Member

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    Iv used pcie slots 1 & 3 with the longer crossfire connectors.
    Runs nice and cool.
     
  11. WishBone17

    WishBone17 Member

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    i'm running my 5870s right next to eachother due to the pcie layout. The top card does get hotter, if you can space them out you will get a cooler temps.

    On average with intensive games when the GPU usage is in the 90%, the top card will hit 80-85* while the bottom card will be around 10* cooler around the 70* on auto fan settings.

    My case is very well ventilated and its winter too. I wish i could space them further apart but unfortently its not possible with my mobo.

    In regards to the front vents on the 5870, Dux pointed this out. As you can see, there is a shroud around the fan, so i'm not sure if it is indeed a intake
     
    Last edited: Jun 11, 2010
  12. raybies

    raybies Member

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    I've underclocked my 5870's... the Sapphire is a crap oc'er, maxed @ 900/1300 and even then BC2 would crash with the screen going beige with lines.
    Using the CCC overdrive auto tune would crash Win7 in 10 seconds.

    The PCS+ happily does 1020/1300 and doesn't crash autotuning.

    They're now both running at 800/1200 (I know like 5850's)... less heat, *less watts/$*, ~same frame rate @ 2560/1600. This suits me cos my BC2 CPU/GPU balance is about right.

    I'm gona try and reduce the volts too... then setup a new site called UCAU :lol:
     
  13. Frontl1ne

    Frontl1ne Member

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    Why do people use the CCC auto tune thing? Isn't that a pile of rubbish?
     
  14. raybies

    raybies Member

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    @Frintl1ne: cos the button's there to press>>> I like pressing buttons, it turns me on :tongue:
     
  15. Onyx

    Onyx Member

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    I have a 140mm fan mounted on the bottom of the case that blows into the GPU intake fans. Even with 2 uneven length cards - lower slot has a 8800GTS (~9"), upper slot has a GTX260 (~10.5"), so the lower card only blocks half the fan intake hole of the top card - I'm still seeing a rise in temp of the top card at idle when the lower card is 100% loaded. If the two were equal length cards, I would imagine the topmost GPU would be struggling even more for cool air and operating temps even worse.
     
  16. OP
    OP
    dcl

    dcl Member

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    Hmmm, interesting. So the air must come in through the bottom, which is almost entirely block off with a second card. :o
     
  17. Korbah

    Korbah Member

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    @Raybies - what case you using there?

    I've got 2x 5850's pcs+ from powercolor. Current case not cutting it cooling wise.
     
  18. Fortigurn

    Fortigurn Member

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    You could try this.
     
  19. raybies

    raybies Member

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    @korbah: As my signature, Fractal Design R2.
     
  20. DivHunter

    DivHunter Member

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    My Amazetech 5870s are spaced on a Classified 760. Reached a shocking 25C running FurMark the other night :lol: It was about 12C ambient and they are water cooled because squirrel fans are too loud.
     

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