Quote:7cm is still quite a large difference.
I don't think another we need space for another radiator.
Assuming the bottom compartment can fit 480+240 radiators, this is enough even for a triple GPU system. And you can also mount a 120 at the exhaust fan and a 240 in the drive bays if you really need more rads.
Besides, it's not just the case becoming larger. Top of a case with top mounted radiator with all the grills and holes never looks quite as neat/classy as solid uncut metal.