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New SF450 and SF600 noisy under load


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A few months back I bought my first SF600 power supply. I love it. It's silent when idle and silent enough under load to be drowned out by my GPU and CPU cooling.


Last week I bought another SF600 for my second system. This one is much louder, even though the second system is identical to the first. Same case, same GPU, same CPU.

I tried the older SF600 in that second system where the new one was noisy, and the older SF600 was still as quiet as I'm used to.


So I sent this unit back thinking it's a dud and got it replaced with an SF450, but it shows the exact same behavior.


Are newer SF450s and SF600s expected to be noisier?

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