Pay attention: there's a mount for 2x120 mm fans, not a radiator. If you see how the motherboard is located inside the case you would notice ther's not enough space for a radiator (plus its fans), and if you have a tall voltage regulator heatsink you wouldn't be able to mount it, like the Asus Z170A he wants to buy. Infact, if you check the product page on Asus website (http://www.corsair.com/en/carbide-series-spec-03-orange-led-mid-tower-gaming-case) there's particularly written "Radiator Mount Locations: Rear: 120mm" and "Compatible Corsair Liquid Coolers: H55, H60, H75, H80i", if it would be able to fit in they would have written it.
Look at this image I found on Google, you can clearly see that a 27 mm radiator plus 25 mm of fans can't fit.
I made the same mistake, I bought a Corsair 200R thinking that 240 mm radiator would be able to stay on the top fan mount location (2x120 mm), but the motherboard heatsink would interfere with it.