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Thanks for the info I’ve had the cooler setup like that for the last 4 years, unfortunately the NZXT H400 only supports front mounted radiators you can probably unofficially mount on top, the cooler pipes aren’t as high up now as you can adjust the angle and they were hitting the fans lol.I would put that rad in the top of the case, running with tubes up like that is not a good idea, you're pushing air around the loop with it like that.
Edit: or at least in the back of the case where you have room to orientate it tubes down.
It’s a 9900K, Idle temp is 30C even in summer and gaming is mid 60s while stress tests on CPU have seen 75C which I think is ok. If or when the cooler gives up, I might just give in and buy a new case to go with it!