In my attempts to bring a 2U rack server with two Intel Xeon E5-2450L by the conversion of passive to active cooling on keller-grade noise level, I have three of these fans to replace with 11000 rpm rotating, deafeningly loud fan system used. So the server was almost living room compatible. Since the power supply units of the server have been certified Platinum, the 40 mm fan of the power supplies do not play a role in the noise emissions. The theoretical capacity of all three fans should be sufficient, but due to the arrangement of the CPUs heats the exhaust air of the radiator on the rear of the front CPU. With a full capacity of the system with 32 Prime95 threads together with active coolers on the CPU increases the temperature of the CPU back to 65 °, even with twelve active threads, the temperature remains above 60 ° Celsius. Here were occupied only three of 12 possible hard drive bays. I have these fans reluctantly Once replaced with other, higher rotating. Following the expansion, I have a fan outside the housing connected together with another 80 mm to a candidate Akasa fan control. Conclusion: This fan is at full speed barely perceptible, especially there is not the hated by me, penetrating whistle. Such a low noise level is surprising for a yet relatively powerful 80mm fan.
