Hi everyone, hope you're all doing well! I've been an avid PC enthusiast for a while now. I recently went all out and made an X299 build. As part of this build I chose an AIO for CPU cooling (bequiet silent loop 360) and a GPU with an AIO (EVGA 1080ti SC2 Hybrid) to meet my need for low temps and noise. I understand a fan based system can be quieter at idle, but I don't think they would be acoustically pleasing under load, and not the best way to go for overclocking (which i have done - 4.5ghz on an i7 7820x). This system was pretty much silent when it was on, and quiet during gaming. It would only sound like a hurricane under stress testing and rendering which is fine. The reason I'm making this thread is that last week the CPU AIO started to develop an awful grinding sound that could clearly be heard over every other component in the system. No amount of tilting or rotating alleviated the sound so it wasn't trapped air. In fact, it was even louder than the GPU pump which buzzed like a beehive. I am therefore considering a custom loop to cool both the GPU and CPU and hopefully, avoid cheap noise pumps altogether. I have a budget of around £500 to do this and wanted to get your advice on what would be the best way to get the quietest watercooling loop. in terms of noise, I'm very sensitive to buzzing/rattling/grinding especially when that is the only noise coming out of the PC. I have an intel 7820x and a Phanteks enthoo atx (tempered glass). I will probably use the 1080ti with a GPU core water block rather than a full coverage one (mainly because there is no full cover block for the EVGA 1080 ti SC2) I understand the main principles of building a loop and i know that i need a reservoir, pump, CPU block, rad(s) and a gpu block but wanted to get the advice of anyone who has had experience with trying to build the quietest waterloop they can. I think the pump will probably be the loudest thing, but running that as low RPM as possible should address that, along with mounting it on foam etc. Would be good to get thoughts, especially on things like would it be better to have 2 radiators in the loop (can run fans slower) or one large rad?