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thanks so its defo worth crossfiring and not just having better card
If its an X58/X79 motherboard then both slots can run at x16 and usually x4 on the 3rd slot if there is one.
As of 2 days ago he said he had this:
Asus P7P55-M
Hopefully he's looking at some form of upgrade, or has upgraded in the last couple of days, otherwise he won't be CrossFiring 2 cards.