I linked my x2 h100i fans to my fan controller and have them set to 1400rpm.....35c on idle but thats at 4.0ghz with speedstep off, so 4.0ghz 24/7.
Any particular reason you have the tubes on the left handside?......nearly everyone does but i thought it would restrict the exhaust fan a tad, so put mine on the right......probs just my OCD kicking in again lol.