Briefly: Ilya can't answer that question because it is not his area of responsibility - his team writes the rendering code, which ostensibly is produced for either ATI, nvidia or any card manufacturer whose hardware supports the DirectX APIs; they have tested with some popular cards. I say 'ostensibly' because both nvidia and ATI sometimes hand over lots of cash to influence a team to code in a particular way that suits their solution best; we don't know if either the red or green team are 'helping' in this way, though I'd guess neither are.
Multiple card set-ups are controlled at the driver level, and theoretically there should be good scaling, however the proof will be in the pudding.
I'd really advise against buying anything until we have some benchmarks in hand.
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