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Most of the MicroATX cases have an offset top-left screw like this:

PSU1

But most of the MicroATX power supplies I'm finding have a rectangular configuration like this:

PSU2

Which is standard? Are there two standards? I'm trying to build a MicroATX, but I don't want to get stuck with something I can't find a good replacement for down the road.

UPDATE: I will try to clarify my question. When people buy MicroATX cases, which kind of power supply do they usually use? Do some MicroATX cases take regular ATX PSUs? Why am I seeing different PSU screw configurations for different cases sold as "MicroATX"? Is there a norm for MicroATX cases / PSUs, or is it random mix and match between several different types?

user353885
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1 Answers1

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Take a look at the standards for power supplies:

http://www.formfactors.org/developer/specs/Power_Supply_Design_Guide_Desktop_Platform_Rev_1_2.pdf

On page 72 onward they show the different types of power supplies and where the screws have to go. Technically any that fall into these categories are "standard power supplies"

Eric F
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