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I didn´t make many different configurations on that regard, just all in or all out (I mean airflow direction) And to me, when setting the fans all to push air into the case, the temps are a bit better in the cpu and gpu, but a little tiny bit, I can´t give you a number because I don´t remember, but it was like 1 or 2 degrees, no more. But eeeevrything else was much hotter, mostly some hours into burning software, specially vrm and chipset was a bit over the top, with the onboard fan whining like crazy at 7.000 rpm or sth like that, so for me it was not the best option.