S th
It looks to me that you're blowing air in the evacuation vent from the video cards. Can't see how that's doing much good. Turn the fans around to pull hot air away and I'm 100% sure you'll get better temps.
Graphics cards suck air in the fan, then blow it out through the heat sink in all directions, so with the big fans they get fresh air as inatke, and the exhaust is blow away
Temps never hit above 75, with modest overclock