I've decided not to get this board afterall as it looks like I won't be able to run a X-Fi and 2 5970 4gig cards in this board.
Although the 5970 4gig card is a 3 slot design it practically blocks out 4 slots over the fan grille. For example, take a look at my EVGA board.
http://www.evga.com/files/Image/58804/141-BL-E760-A1_XL_5.jpg
In a normal 2 slot design card, you could sitll squeeze a 2nd card into the 2nd PCI-e slot. However with this 5970, the 2nd red slot is blocked as expected, but so is the PCI slot below it!! This is due to the fan grilles on the card!!!
Now a lot of people are getting the Rampage III board
http://www.hardwarebloggo.com/wp-content/uploads/asus_rampage_extreme.jpg
Looks familiar doesn't it. I'm betting the PCI-e 4x slot will be inaccessable just like the EVGA board. So if you ever want to run a separate sound card you are going to have to use the 3rd or 4th PCI-e 16x slot. More importantly if you ever want to ad another 5970 4gig, you will have to go back to onboard sound, or else add a dual slot card instead and use the last red PCI-e 16x slot for sound.
Not a problem with my EVGA as I can slap the soundcard in the very top PCI-e 1x slot. But no usb 3.0 or SATA 3