if you crossfire 2 different cards say 4850 with a 4870 which i did if you don't turn 1 of the cards up or down to match there speed you will and can get a micro stutter that makes playing any game crappy this is from experience not something i read on a forum. so I thought maybe just bad luck so i tried a regular 4870 with mine but my one is a palit and is overclocked so the speeds are different i had to under-clock my 4870 to stop the stutter and that's with two of the same cards running at slightly different speeds.
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