ATX Dell PSU to Offical ATX 2.0 spec pinout
PSON is short for Power Supply On, so that is the same as PS-On from the ATX spec, and you can just power the power good with the 5v signal.
Related videos on Youtube
StealthRT
Updated on September 18, 2022Comments
-
StealthRT almost 2 years
Hey all I am using an old Dell Precision R5400 which has the 750w hot swap-able power supply. Problem being, since its a dell, the ATX pin layout is different than that of a normal, standard ATX 2.0 power supply pin out.
What I found to be the Standard ATX 2.0 pinout:
I have taken a volt meter to the R5400's ATX pinout and this is what I come up with:
[1] Ground [13] Ground [2] +5v [14] +5v [3] +5v [15] +5v [4] +12v [16] +3.3vsb [5] -12v [17] Ground [6] Ground [18] Ground [7] +3.3vsb [19] +12v [8] +3.3v [20] +3.3vsb [9] Ground [21] +12v [10] +3.3v [22] +3.3v [11] +3.3v [23] +3.3v [12] +3.3v [24] +3.3vsb
Thankfully my motherboard's manual shows the pinout of it's ATX power supply connector:
So some questions are still wondering inside my head:
1) What voltage should the PSON# be? 2) What voltage should the Power OK be? 3) As you see, I do not have access to a +5Vsb from the R5400 PSU. Can I just use a normal 5vdc for that (or somehow get 3.3vsb that I do have to work with it)?
Currently this is my pin-out for my new connector from the R5400 connector to the motherboard:
So do you see anything wrong with the above? Just making sure as I do not want to fry a $500+ server motherboard over one wrong pin.
-
DoxyLover about 9 yearsYour big problem will be the 5VSB. This needs to be supplied to the mobo before it can assert PSON# so you can't use a normal 5V line and 3.3V won't be enough. You may be able to feed the 3.3VSB into a boost regulator to get 5V but I don't know if the line will supply enough current.
-