I think the BE QUIET PURE ROCK 2 is rated at 150 watts...
And according to Corsair, the H100 is good for about 140 watts...
And you're trying to cool a CPU that can put out 180 watts at peak.
What do YOU think about that? Because to me, that sounds like something I wouldn't do.
I think ANY cpu cooler you put on there will work if you don't intend to use it to it's maximum potential.
But if you didn't intend to use it to it's maximum potential, why didn't you just get a lesser model i5?
As a general rule on aios, 120mm = 150w, 140mm = 180w, 240mm = 250w, 280mm = 300w, 360mm = 350w and a 420mm = 400w. That applies to Capacity, not Efficiency.
A Noctua NH-D15 has the same 250w Capacity as a 240mm AIO, but depending on the exact model of the AIO, the NH-D15 can offer better or worse temps, because actual temps and performance are dictated by Efficiency.
The beQuiet PureRock 2 is rated at 150w, so would be equitable to a Corsair H60i as far as Capacity goes, not the Corsair H100i, which would be equitable to the beQuiet DarkRock Pro4. Which of those 4 coolers gets better temps will be upto the loads vs efficiency of the cooler.
A 65w Ryzen is going to see almost the same performance from any of the 4 coolers, very little varience, but a heavily loaded i7/i9 is going to destroy the 2x 150w coolers chances of workable temps.
Case airflow is a highly complex subject, and tied directly to the case in question. With the NZXT H500 series, that case happens to be the exact wrong dimensions physically for front intake fans. A fan works by creating a low pressure area in front of it, the byproduct being the pressure wave of air out the back. The H500 series suffers from a lack of supply to the front intakes, so there's very little air out the back of the fan. However, it's enough to balance out the pressure inside.
Nature abhors a vacuum, so air will physically move from higher pressure intakes to the low pressure created by the exhaust. With a balance of pressure inside, there's very little air movement, so any radiated heat from cpu/gpu exhausts goes nowhere except back around to the gpu/cpu fans, and temps climb on those components.
Having a totally negative system, just using the 2x exhaust fans, means the gpu fans pull air from the rear area directly, a very short distance, and has no choice but to go directly to the case exhaust low pressure area. Far more effective and efficient, and the air actually moves so case temps are lower, as is component temps.