DFI LP DK X58-T3eH6, 3 PCI-E x16 (x16/x16) (x16/x16/x4) with 2-way SLI and Quad CrossFireX configuration,
DFI LP UT X58-T3eH8, 3 PCI-E x16 (x16/x16) (x16/x8/x8) with 3-way SLI and Quad Crossfire.
Which one is better? I have heard someone recommends the 2nd one because of its x8 ability instead of x4. Is this of any effect? What if I want to SLI 2 Nvidia Geforce cards?
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More aboutcrossfirex capability
If you only want to run 2 cards then it doesn't matter, both would run at the speeds in the first brackets (x16/x16). But if you wanted to run 3 then the second board would be better. You would see a bit of a performance increase by going with the second one running 3 cards as long as your running some mid cards like HD 5770s or better.
I would not recommend 3 cards though as it doesn't scale well past 2 cards. So if the first is much cheaper then get it. Don't waste money on stuff you don't need.