Thread: 24 pin PSU
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Old 28-01-2009, 23:56   #9
Matth
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Re: 24 pin PSU
With ATX12v 2.0, the specification moved to the 24 pin, carrying an additional line for each major voltage.
In general the extra 4 for this purpose is often detachable to allow a 24 pin PSU to serve 20 pin requirements, and a 24 pin motherboard may work ok with a 20 pin PSU.

Nominally, the extra pins on the main power connector serve the additional requirements of PCI-E slot powered cards, while the seperate 4 pin (possibly 8 pin) ATX12V connector serves the CPU.

Even if not using high demand cards, it is best to use the full 24 pin main power, as well as the ATX12V - it is NOT either/or.
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