Questions are a good thing, after all thats why this forum is here!
Again a great board for the price, I have two MSI boards myself and both are excellent.
This Board has two PCI-EX x16 slots and is SLI enabled. So it will run SLI (two nvidia cards working together on the same motherboard)
So to clarify, this board will run:
One ATI PCI-Express card
or
One Nvidia PCI-Express card
or
Two Nvidia PCI-Express cards in SLI
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