I've just recently started litecoin mining on a kind of old AMD GPU. My motherboard has space for 2 additional cards. I'd like to drop in a new card specifically for litecoin mining, but... I'm not sure if the two cards need to be identical. Crossfire stuff is confusing me. If I drop in a second card can it be top of the line and still have my old card do some work?

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The cards don't need to be identical. Your mining software should identify each GPU and allow you to control/use each one separately.

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