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I'm building a desktop and I'm going to get the SilverStone SST-ST50F 500W as my PSU. What form-factor is it?

Is it ATX, following the motherboard form-factor or different?

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up vote 1 down vote accepted

"ATX" when used with a PSU refers to the power and signaling specifications.

Standard PSUs have had the same form factor for a very long time, all the way back to the AT PSU days. The only difference is the number and arrangement of power pins, and the use of a physical switch versus soft-signaling.

And yes, the PSU you name should work with a ATX motherboard.

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