NZXT G10 where to put my X60

Hey guys!

I'm thinking of getting an NZXT G10 for my HD 7970 and then also getting an NZXT X60.

Now I already have a Antec Kühler H2O 620 on my CPU (i7 3770k) but as I'm mainly a gamer (and game dev) I don't use my CPU much, don't even have it OC'd.
But I've heard a lot of people saying that overall CPU's get hotter then GPUs. 

So my question is: Should I put the x60 on the GPU or swap the coolers and put the x60 on my CPU?