Don't MSI 7950's and Sapphires exhaust out the back (through the bracket vents)? If so, aren't the box fans on the wrong side of the the rigs? Essentially it looks like you're blowing back into the exhausts.
Unless those box fans are facing the other way and you're actually pulling the hot air away... hard to tell.
This is the most common question I get asked...
Yes, I am blowing air into the same end that have the display ports. This is because the fans are axial. They simply suck air in from the side and then blow it directly over the heatsinks. The air is then exhausted pretty much at random from that point although more comes out the end opposite the display ports than does the end with the display ports. I tried flipping the cards around and blowing air into the end opposite the display ports and the temps were 10+ degrees higher versus the way I have it setup now.