How can I make this work?

[kupofjoe]

So I am pretty young and very noviced with all of this stuff. (All of this stuff including single board development computers, micro-controllers, hell even basic circuitry and soldering is something that I'm quite novice at.) I have already made a few simple projects with Arduino and Pi Zero, but for this next project I am messing with  Raspberry Pi 3 and am quite overwhelmed with the capabilities/potential this little computer has compared to the Zero and Arduinos.

Essentially I plan to make a RetroPie emulation system, and I will actually be making it VERY similar to this particular design

In fact, I will use a very similar USB hub, the exact same Power Button and the ATXRaspi (when it comes back in stock that is, any word on that? :b). I'm 99% positive I know how to get this thing going and all connected together, but I was also considering overclocking the Pi and in accordance getting a small 40 mm fan, something like this  to provide the Pi with cool air. Is there any possible way I could wire this fan up with this sort of build? Or would that be placing to much of a load on the whole set up?

[Felix]

Back in stock now.
As far as I can remember jessie won't allow you to overclock the Pi3 any more. It might have changed in a recent release.
My guess is you never have to even overclock the Pi3 since its so very much faster than older versions.
But for overclocking and fans and stuff like that please ask in the Pi forums, you might get more accurate answers about this question there.
As it is mentioned in this forum numerous times and in the spec pages, the ATXRaspi is intended to power the Pi ONLY, not additional hard drive, fans, hubs, devices etc. You can power any additional loads through a mosfet or transistor or relay, driven by the output of the ATXRaspi (ie when it turns on it would turn on your transistor that switches a fan or other load ON as well).