What's the pinout for a PSU with BOTH 24 and 20 pin connectors?

Hi all,

This is my first post so please forgive if I'm posting in wrong place, etc.

I am trying to figure out the pin-out of my PSU as I want to test to see if it is working properly. Am confused by the connectors it has.

I have a Dell Precision T5400, which has an EATX format mobo. On this mobo there are two PSU connections: P1 which is 24 pins and P2 which is 20 pins.

The PSU I have is an 875W unit which has the 2 connectors mentioned plus 1x 4-pin mole and 2x 6-pin connectors:


My PC won't boot, but there appears to be some power to the mobo, so I think that either it's the PSU or the mobo which is faulty. If I know the correct pinout i should be able to test with a multimeter?

Unfortunately I can't find anywhere on the internet information about my type of PSU, it seems most ATX types have either a 20 or 24 pin connector not BOTH OR at least those are the only articles that pop up during a Google search.

Would really appreciate any help on this. Thanks in advance!
2 answers Last reply
More about pinout psu pin connectors
  1. Watch this video it will guide you on the connections:

  2. I know this thread is a bit old, but I'm not seeing anyone post the answer. googling "T5400 pinout" found me this.

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