Optiplex proprietary 8 pin and 6 pin pinout

i have a power supply from an optiplex 7040. It is model L24OEM-00. With the 8 pin adapter. Will I be able to use this on a bench to power small electronics that are below the Ps specs?

the 8 pin adapter works one way only: convert 24 pin ATX psu to male 8 pin to power Dell oem board.  I do not see how you can connect the adapter to 7040 oem psu which has the male 8 pin already.  I also do not know if there is a reverse adapter to convert the Dell psu 8 pin back to 24 pin.  I think not because the Dell 8 pin is 12Vonly.

@redxps630​ 

You have caused quite a bit of hurt feelings and "Engineering Angst amongst people who have spent years in the industry, designing very clever and elegant (complicated) solutions to our daily computer needs. So just to put fears to rest, I tried your solution with all the parts out of their case so I could set up 3 different monitoring stations... 1 at the hacked power supply, 1 at the motherboard in question (optiplex 7020), 1 at the SATA POWER connectors the motherboard supplies.

I should first disclaim, that I have actually done this trick several times before and was confident I already knew the outcome... I recycle my old computers and car audio amplifiers into New home theater speakers, that are self powered/amplified with line level inputs, and bluetooth connectivity (thanks to donor earbuds, that always seem to lose one side).

AFTER TESTING: It all performed as expected, The Power Supply as expected powers on and stays powered for the entire time it is plugged in/hard switched... the voltage/amp numbers were correct across all wires, even those unused. The mother board behaves just as it would when connected to a DELL PSU, other than reset, there is no "soft button" power switching, so pretty much it also is always on... Lastly the voltages on the SATA Connector are all correct, which I expected...

Thoughts:

Ok so in a pinch if you wanted to power your PC, and for whatever reason could not obtain an elegantly designed thoughtful solution, one could hack up conceivably any power supply giving the correct voltage in smooth enough pulses.

Unless faulty the mother board is only going draw away the power it needs in the correct number of AMPS... here is where the HACK shows its ugliest problem...

I have at least 40 extra PSU's sitting around in various states of factory condition, NONE of them except the DELL PSU's for these 8 pin units, have a +12v connection lower than 10 amps, The rating on all of my DELL PSU's is never more than +12vsb 1.8 amps... This tells me that if an "Wake On" device that is faulty or shorted now has access to a full 12v 10 amp signal, and none of the onboard protection is designed around 10 amps for this circuit.

If you are the everyday slacker hacker, this is OK, because you at most de-solder some components and chuck your mobo when it fails... If you are the type that fixes everything, when this Hack ATX/8 Pin Mobo combination fails, you will be fixing everything.

So lastly if you just throw it out when it breaks, and need a computer now!!! Hack an ATX, give all 3 connections 12v, supply the other connections with their required voltages/polarity and off you go, Just remember It is now the 1980's again, and you have to Switch off or unplug your pc when done with it.

@speedstep​ bueno pero no te emputes

I have a 9020 MT and I want to install an ATX psu. I have the correct adapter cable. I want to test the psu and cable before installing. How do I turn on the psu using the 8-pin adaptor? Is it as simple as connecting PS_ON to a Gnd pin? Thanks.

@wwbeagle​ Hello Sir, did you manage to convert from 8-6 ? Did you actually just left lose Purple 12V SB wire from 8 pin connector and reconnect according to 6 pin diagram?

Im facing the same issue- my own fault- I didn't check if PSU is with 6 or 8 pins for MB.

Thanks in advance

@wwbeagle​ 

I know it's an old post but did you manage to test or found the answer if it's just the case of relocating wires from 8 pin to 6 pin and leave 12V SB lose?