I've been using Corsair H80i V2 for a while now and quite happy. However since changing to Zotac RTX 2080 from 1080 TI FE, the AIO is sucking all that hot air from the GPU. I wanted to use 240 mm AIO and put it on the top, apparently I can't do that due to my Corsair Vengeance RGB with its 44 mm height intruding the space for the rad+fan.
For future reference, what measurements should I get when I want to put a 240 mm or longer rad + fan on the top of the case without any issue with memory height?
I'm currently using Fractal Design Define Mini C. On the case website, it said it supports 240 mm AIO on top, obviously not taking into account tall memory module. The Mini C is a micro-ATX case, however the Define C, the ATX model is only taller just because of the additional PCI-E slots. It has the same top of the case clearance as the Mini C. So I don't know which measurement should I take if I want to use a top mounted radiator.