6870 Crossfire stability issues while mining

[makuab]

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

[xane]

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]

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.

[makuab]

bump

[xane]

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.

[patboy247]

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.