Join Date: Oct 2011
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2600k provides GPU lanes from the CPU itself, which run natively at x8/x8. Boards that provide additional lanes come from NF200, an addon chip from Nvidia. The problem is NF200 adds additional latency and ends up being very similar in performance to the native x8/x8 bandwidth (if not slower I would imagine.) Take a look at the Maximus IV Extreme-Z. It has an NF200 chip, but for two cards it only runs the native x8/x8 and only utilizes NF200 when three cards come into play for x16/x16/x8 bandwidth which makes sense.
So basically, don't waste your time on a board with NF200 if you're just going to run two GPUs (you can save some money too ). If you're running three GPUs, then it actually makes it worth it but with only two you will see equal performance with the native x8/x8 lanes. I particularly like the AsRock Gen3 (not the Extreme7, the lower models) boards, you should take a look at those.