Does work, usability is questionable

The cooler does work, is cleaned, and at idle can give sub 30C temps, but when given a significant load (gaming or downloading) it starts to overheat, and some cases throttles (cooling an i7-8700). My personal heatsink (some 92mm Noctua cooler) outperformed the AIO by a lot.

I suspect it’s low coolant level, but given that it’s an AIO, I can’t refill it.

I will provide any and all mounting I have, which is four sets of mounting of various descriptions. I know for a fact that the LGA 115X mounting is there.