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HD 7970 crossfire question - Page 2

post #11 of 14
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Originally Posted by Ixel View Post

Wonderful replies! Thanks very much. I've done a bit more reading and apparently for mining with GPU's it's not really ideal to use crossfire, but to have them operates as individual GPU's instead. In that event (running them as individual GPU's) I imagine it wouldn't matter if I had two 7970's which differed slightly in stock speed? If they did however go into crossfire in the future, would I be able to get round the differences in speed by simply lowering the faster clocked GPU to match the slower clocked GPU, or must it be identical regardless?

Thanks in advance, +rep'd everyone so far for their helpful responses.

In the event you did use them for crossfire you could simply overclock the slower card to match the faster one, or as you stated, lowering the clock on the faster card. It would be more advantageous to overclock rather than lower the frequency, unless you want to conserve energy tongue.gif.

I would say that just about any card you get will be able to at least match the stock speed of the overclocked versions without any voltage increase.
post #12 of 14
Thread Starter 
Ok, thanks all.
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post #13 of 14
i recently crossfired my 7950 and 7970 (both stock) and they seem to run on their own speeds according to GPUZ and MSI AB. i never had issues such as stuttering when i played bf3 and c3. valley, though, stuttered but i had the 7950 oc'ed so idk for sure.
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post #14 of 14
Thread Starter 
Just a note to say that after reading all the responses on this thread, with some luck I've managed to get a card that's almost identical to the one I currently have, from eBay used but apparently in perfect condition and good feedback score, a Powercolor V3 HD 7970 3GB. Thanks everyone for the help today.
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