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Author Topic: 6850 running 98*C stock?  (Read 1727 times)
dank
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June 13, 2011, 03:39:47 AM
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I just bought two 6850's for my first non-dedicated mining rig.  One is running at 68*C and the other at 98*C.  Is this a concern?  Both of them are running next to each other so I'm guessing it's having a hard time circulating air.  I under clocked the memory which had no noticeable affect.  Any help is appreciated, I'd like to be able to overclock these cards without worrying about the temperature.

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June 13, 2011, 05:18:53 AM
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Yes 98C is way to high. You can keep going at that temp at the expense of the life of your card or try to keep it cooler. You want it to be under 80c I think is the rule of thumb.

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June 13, 2011, 06:49:15 AM
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I can get it down to about 85.  It's odd, the other card can oc to 875mhz at 70*C.

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June 13, 2011, 06:59:30 AM
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This is bad long term (and even short term).

Put something in between the cards to space them out, like the lid of the 2 liter soda bottle or a tube of carmex.
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June 13, 2011, 02:15:23 PM
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This is bad long term (and even short term).

Put something in between the cards to space them out, like the lid of the 2 liter soda bottle or a tube of carmex.

Spacing them out a little could make a huge difference.  You can also put a fan or 2 on top of them.
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June 13, 2011, 02:21:03 PM
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check physical temp[use IR termometer]. built-in sensor can fail/lie, sometimes.
change thermal interface, check GPU chip integrity, clean dust from GPU/PC case by VC, monitor PSU fluctuations under load by hardware monitor[at least use one of "digital multi-meter" things], upgrade PC case to something with more space and better airflow and etc and etc.
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November 06, 2013, 12:46:47 PM
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I saw this old topic but had to post this for anyone that is curious.

I had the *exact* same issue, with the same cards. I ended up putting them into two different PCs.
Also x-fire seems to NOT stack perfectly, so that the overall hash/s is not really doubled.
Generally, what I did when I had both cards x-fired was underclock the hot card a *lot*.
Kind of a disappointing issue. But also, if there is some cleverly put ventillation / cooling it seems
that it helps.
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November 06, 2013, 01:01:26 PM
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For dedicated mining you want the crossfire bridge off.

What's odd on my altcoin rig is that I've got 2 cards wedged apart with a drive rail for breathing space, and the unobstructed card is the one that runs hottest, I swapped them round and same thing, maybe they radiate a lot more heat from the backside than you would think.

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November 06, 2013, 01:30:18 PM
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I just bought two 6850's for my first non-dedicated mining rig.  One is running at 68*C and the other at 98*C.  Is this a concern?  Both of them are running next to each other so I'm guessing it's having a hard time circulating air.  I under clocked the memory which had no noticeable affect.  Any help is appreciated, I'd like to be able to overclock these cards without worrying about the temperature.

First, undervolt both GPU as low as you can, buy some fan to exhaust the heat from the first GPU so minimize the heat for the 2nd GPU. Anyway its best that you get some 16x PCIE extender to separate the two card as far as possible.
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November 06, 2013, 02:23:47 PM
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You should try to switch there places, it can help sometimes.
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November 08, 2013, 06:21:13 PM
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98 C is way to hot i would recommend running GPUs at 75-80 c max !
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