Review on 🔧 GeeekPi 2pcs Raspberry Pi 4 Quiet Fan, RGB Cooling Fan 40x40x10mm 4010 Fan DC 5V Brushless CPU Cooler Radiator for Raspberry Pi 4 Model B, Raspberry Pi 3B+/3B/2B (Multicolour) by Andre Motko

The fans on my replacement 6 x 2.5" 5.25" Icy Dock became noisy and then one of them died. They had wiring that suited my needs (2 wires with separate connectors). They move enough air to make a difference. I didn't care about the LEDs since they're on the server, but they were the cheapest fans at the time of purchase. They beautify the inside of my server. I can't say much about the volume as other fans in other parts of the server rack are louder.