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What on earth does 20+4 mean?

Does that mean it can work on a 20 pin MoBo or a 24 pin MoBo?

Thanks
 

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yep, that is exactly what it means. the new ATX standard utilizes a 24pin atx connector. the extra 4 pins are for more 12v power lines to the mobo. So the 20+4 is a newer style atx2.0 compatable psu, but the extra 4 pins can be unclipped so the psu can still be used in an older mobo.

I would venture to say that your mobo requires a 24pin psu so you'd be safe with either a 20+4 or a full 24pin psu
 
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