I've had the Enermax Liqtech TR4 360 AIO running for about on my Threadripper 1950x inside of a Thermaltake Core P90 case. After a few months, I noticed what honestly sounded like a "gurgling" sound. I immediately attributed it to the block/radiator and double/triple-checked my connections to the headers, settings in BIOS, etc, to ensure there was only a constant, max voltage going to the pump (there was). Since the sound seemed to come from the radiator, I used my fingers to stop the fans one by one, and the middle one was the culprit. I unplugged it, since this is my work PC as well as my gaming rig (not overclocked yet) and I was starting to lose my sanity. The inop fan has been in the back of my mind, but I hadn't worried about it too much... until yesterday. This time, it was a different, much louder noise coming from the top fan. The good thing is that it's only when it's spinning really fast, ie, when gaming. So I put in a ticket with Enermax and it seems like they are just going to send me some new fans. But I'll probably go through this all over again when the replacement fans (assuming they're the same) start making noise. Has anyone replaced these fans with something better? I don't want to add more noise, but if there is a fan that flows better without much/any additional noise, and is more reliable, I'd definitely want to change. Suggestions?