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Help me understand pc case power needs

redfenixredfenix Aka'd as rfixRegistered User regular
http://www.newegg.com/Product/Product.aspx?Item=N82E16814143118

on there it says,

"425W PCI Express-compliant system power supply with a combined 12V current rating of 28A or more
One 6-pin PCI Express supplementary power connector -or- Two 4-pin Molex supplementary power connectors"

so that's 2x of 12V rails, at 14A or more.

from what i'm reading about power supplies, they seem to come with 2 12V rails, but is one of them for the motherboard?

I don't really understand.

redfenix on
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