Which fan is more effective connecting to PSU?

DrDomVonDoom

Reputable
Feb 20, 2014
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4,510
Im building my first rig, and I wanted something small and portable, so I'm building a ITX in a Bitfenix prodigy case.

I bought the MSI Z78 AC Gaming itx Motherboard,

now for now I will be using the two stock fans, at least until I decide if Im gonna do more fans or get a liquid cooling unit, anyhow theres only 2 fan connectors, one for the CPU fan, and another that says sys fan. I figure Im going to have to connect a fan to the PSU, which would be more effective? Connecting the intake or the outtake?