20 and 24 pin ATX PSU?

  • Thread starter Thread starter Gerry_uk
  • Start date Start date
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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?
 
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?
Click to expand...
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.
 
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.
Click to expand...

OK thanks. This makes sense.
 
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