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sorry, forgot to mantion, it is HD4870 overclocked edition 800mhz/3800mhz!
so I cam mix with it any HD4870..?

i thought a 46xx card can be crossfired with a 48xx card. e.g a 4670 + a 4850.They need to be the same series (e.g. 4 series) and class (e.g. 48XX), that is it, the rest doesn't matter.
By that I mean you can have 2-4 48XX cards, or 2-4 46XX cards, or 2-4 38XX cards etc etc.
But you can't have a 48XX + 46XX or a 48XX with a 38XX etc etc.
