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Author Topic: 6870 Crossfire stability issues while mining  (Read 1250 times)
makuab
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June 20, 2011, 04:39:42 PM
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I'm having a lot of trouble, it's quite frustrating. Almost always when I OC my cards, pheonix and guiminer both make my comp freeze, I dont understand, can someone give me a reference overclock for a 6870 with like 300 mhash/s? Im just having so much trouble with msi afterburner, I changed the registry thing and added those lines to msi afterburner's .cfg
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Each block is stacked on top of the previous one. Adding another block to the top makes all lower blocks more difficult to remove: there is more "weight" above each block. A transaction in a block 6 blocks deep (6 confirmations) will be very difficult to remove.
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xane
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June 20, 2011, 04:49:30 PM
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What kind of power suppy do you have? Also, you may need to up your voltage on the cards to compensate for the increased clock speeds.
makuab
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June 20, 2011, 04:52:23 PM
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What kind of power suppy do you have? Also, you may need to up your voltage on the cards to compensate for the increased clock speeds.

corsair 750TX, I read that people run it at 1020 core at stock voltage, and I tried up to like 1.22v but couldnt get past 990 mhz.
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June 20, 2011, 05:05:57 PM
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bump
xane
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June 20, 2011, 05:08:20 PM
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Every card is different. I have two 6870s and cant go past 990 without stability issues. Heat is also a big factor. Only way to really get extreme clocks is with a very good cooling solution. I also have a 1000w psu. If you have 2+ cards and other high end hardware, 750w might not be enough. You can use a voltage monitor to see how many watts your rig is trying to pull from the wall. The hardware list is just a reference too. Take all data with a grain of salt.
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June 21, 2011, 02:21:14 AM
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i run 2 6870's at 980mhz and drastically lower the memory clock to get about 282mh/sec. I agree with the person above that going over 1000 is very unstable. Also i am able to run the two cards and a ton of fans and other crap on a 750 so u should be fine there.

I have nothing relevant too add.
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