Interestingly despite what a lot of people say actually having the side panel fan as outake increased temps by over 7 degrees. What did seem to make sense was the whole idea of heat rising having the lower fans as intakes and upper fans as outakes seem to force the warm air out.
Look over the results yourself if anyone else has time to test this then please share your results.
I think this result only confirm that for the HAF-X it is better to have the the 200mm side-panel fan as intake rather than exhaust, but I don't think it applies as valid result for midi-cases of other models.
Just a couple of things I would like to point out:
i) For the HAF-X, the drive bays restrict airflow from front intake, so cool air simply isn't getting into a main department of the case at a effective rate, therefore not enough cool air reaching the graphic card's cooler if the side-panel was exhaust instead of intake
ii) The 200mm fan on the side-panel of the HAF-X pretty much nearly cover the full length of the graphic card, where as more midi-case only got a 120mm on the side-panel, which only roughly cover half of the graphic card's length on the left (rear) side. Also the side-panel has a shroud for channeling the air-intake to the right, so it increase the efficiency of the fan as intake, but get in the way when the fan is used as exhaust instead.
iii) Midi cases don't have the luxory of two 200mm on top as exhaust
For my CoolerMaster 690II with MSI 5850 Twin FrozRII, the differcent between having the side-panel (with a 120mm fan) as exhaust and intake was that temp was was roughly 4-5C higher on intaken than exhaust. This is with good intake and with the unneeded removable drive bays removed.
So having good default amount of air-intake or not and case layout/design would be the determining factor.