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September 04, 2011, 09:48:55 AM |
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For mining purposes, it doesn't matter which series of cards you mix (compared with crossfire, in which you must use the same series of card).
You should be able to run two 5850s with that PSU, but certainly not two 6990s. CPU and ram can be almost anything - it doesn't affect hashrates.
Many will tell you not to bother, but to me (and to many others) mining is a hobby, though I think it's fair to say that those of us mining with big hashrates typically paid their hardware costs off a long time ago.
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