Brand new gaming PC.
Did you have any trouble putting the radiator in the case? I was recently doing my build and I had a hard time doing that with the H440.
Any NZXT AIO will fit into the H440. They were made for that specific reason. You can fit up to a 38.5mm rad and a normal fan thickness into the H440 on the top. My rad only just fitted, I had to speak to NZXT directly to confirm that it would fit:)
Sorry buddy, only just seen this. Not massively, it was a bit fiddly and I experimented with the fans above and below the radiator without any massive issues (had the MB fitted too).