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This review is from: Noctua NF-F12PWM Case Fan 120 mm (Personal Computers)
You really get what you pay for with these fans. The performance:noise ratio is genuinely stunning. I use these in place of the stock fans on my corsair H100i, and not only are they roughly 10000% quieter (and spin at half the rpm), they perform just as well as the corsair ones. If you can stomach the price and the colour, then look no further.