Originally Posted by Mikecdm
The board is better at overclocking memory than some of the others that I've used. I had a P9X79 pro and the RIVBE is a bit better with memory and I was able to push the cpu a bit further on LN2. I still think my CPU is a very poor sample. I don't think it's going to help much on air/water cooling though. I've seen the MSI x79-GD45plus push chips to 6ghz on LN2, but it still sucks with memory clocking.
There is a molex on the very bottom of the board to supply extra power to the pci-e lanes when running 4-way. I have no clue if it's necessary to use in the configuration you mentioned above, but I doubt it.. I don't think it would draw as much power as 4 gpu running full load.
I don't work for Asus or anything, don't take anything I say as fact. It's just my opinion based on my experience with the board and other boards.
...not unlike the one and only review I could find so far (from a Norwegian site that compared the Rampage IV Extreme X79 Black Edition to a Rampage IV Gene)...either the same in some benches, or a bit faster in others...and no, I didn't bookmark that review, unfortunately