20 and 24 pin ATX PSU?


G

Gerry_uk

Hi,

I'm using ASUS P5WDG2-WS-PRO Mainboard, it has a 24 pin ATX power
connector, but my old Antec PSU only has a 20 pin connector.

As I understand it, the extra 4 pins are for the PCI-E (x16) cards?

However, I have connected a single Sapphire X1300 Radeon into the
primary PCI-E slot and everything appears to be working.

I therefore don't understand the extra 4 pins on this connector?
 
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P

pen

Gerry_uk said:
Hi,

I'm using ASUS P5WDG2-WS-PRO Mainboard, it has a 24 pin ATX power
connector, but my old Antec PSU only has a 20 pin connector.

As I understand it, the extra 4 pins are for the PCI-E (x16) cards?

However, I have connected a single Sapphire X1300 Radeon into the primary
PCI-E slot and everything appears to be working.

I therefore don't understand the extra 4 pins on this connector?
The extra pins are additional power wires, one each for
+3.3V, +5V and +12V and common to supply additional current. They are
redundant and merely provide additional current carrying capacity.
This will prevent voltage drops on boards with high current drain.
 
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G

Gerry_uk

pen said:
The extra pins are additional power wires, one each for
+3.3V, +5V and +12V and common to supply additional current. They are
redundant and merely provide additional current carrying capacity.
This will prevent voltage drops on boards with high current drain.

OK thanks. This makes sense.
 

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