If you are OK with Noctuas standard colors then the new NF-A12 is the one you want. it's silent and very efficient, On my system I can't hear them, the noisiest component is the RAID 5 HDD array in the PC and the D5 pump. I replaced 14 NF-F12 with 7 NF-A12x25 without loosing temp and even gaining on noise. You start hearing them at about 1000-1200rpm and ity's the low noctua hum.

To be honest your issue starts there : Zitat I am building a system with two watercooling loops (one for CPU, one for triple GPU), four 560mm radiators and 32x NF-A14 IPPC-3000 PWM fans (8 fans per radiator in a push pull setup). Two radiators (16 total fans) will cool the CPU loop, and the other two radiators (remaining 16 fans) will cool the GPU loop. All of this will be powered by an EVGA 1600 watt T2 powersupply. Your PC could easily be watercooled with one 360 rad for the CPU with 3 fans (N...