Sorry pump, you will hear all the GPU AIO pumps at some level of sound as they run at 100% 'usually'. I can hear my Arous pump, but its very low and only noticeable at night when the house and streets are quite.How do you mean audible? Pump or coil ?
CPU AIOs, you can adjust the pump speed. My one starts at 2,800 and is very audible until it's adjusted under 1900 rpm for example.
Coil whine- If I open the case, stick my ear in and run a benchmark, there is some low whine, but the lowest I had from trying 6 5090s. Can't hear any whine from gaming at all, or benching with the case closed.