Digituz 350W ATX Power Supply Review @ HardwareZoom

"However, the main attraction is the big 120mm fan. When you have a fan this big, you don't need it to spin super fast in order to get good air flow. Which means we can have less noise without compromising good air flow performance. This is no rocket science, but for some strange reasons, most manufacturers are still using small fans for their PSU. "

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