Seriously?

EDIT: I noticed you are using 2 PSU's instead of the PSU that comes with the S4, in that case, that makes more sense, as they can deliver a hell of a lot more power than a 1200W PSU. For those using the PSU that comes with the S4, do not expect such results, but then again if you have some spare PSU's this seems like a really really good idea, in fact I just might have to give it a shot at some point.