How to replace HP power supply with standard ATX PSU (PWRCMD + 2x 4-pin)

This is how I wired a standard ATX PSU to a computer with HP's non-standard/proprietary PSU with 2x 4-pin and 7-pin PWRCMD connectors. This allowed me to upgrade my graphics card.

Works at least for HP Desktop M01-F1823no with L70042-006 power supply (and possibly for many other models). Motherboard might be ERICA 3 or ERICA 5 or something else.

Note that there might be multiple variations of HP power supply wiring configurations, even if they are using the same connectors. You can try to check the pin configuration using a multimeter, if you are unsure.

[watergust]

I just did this on an HP envy desktop! (like literally just now so I guess TBD whether it stays stable...)
My HP had a 7-pin PWRCMD plug with only three of the pins in use; green black and grey on the 1st, 3rd, and 4th pins. I assumed that green was pwr on, black was gnd, and grey was pwr good.
I hotwired from the ATX motherboard plug on the PSU to connect the PSU pwr on, PSU gnd, and PWRCMD gnd together, then I connected pwr good from the PSU to the pwr good from PWRCMD (just like in the video).

I didn't use a switch at all. I just wired those pins to each other, ran power to the two 4-pin 12V CPU connectors on the motherboard from one of the 8-pin PCIe spots on the new PSU, and it all works great! I just turn the PC on and off with the stock power button on the front. It seems to power all the way down and then all the way up again without issue. I do have an external power switch on the PSU if I want it, but so far it seems like I might not need it.
I'm using a Corsair 750W SFX PSU.
Thanks so much for the info in this video! Fingers crossed my system stays happy!

[RohanCAV]

Amazingly useful thanks. It's ridiculous that HP do this, so anti-consumer.

[NiklasUnruh]

Thanks! Just did your hack on my Elitedesk 800 G3 and it works perfectly fine!
Mine actually had all 7 wires connected but i read somewhere else that you can safely ignore those as they are mostly for the fan. It just spits out a "Fan not detected"-error on bootup now.

Edit: I opened up the PSU and here are the mappings beginning with the side of the connector thats closer to the 4 pin power connector:
- Black: RTN2 --> GND
- Purple: METER
- Gray: PSU_ID
- Green: PS_DN
- Black: RTN2
- White: TAC1
- Red: FAN_CMD

[dimitris]

Note for anyone reading this. Standard ATX PSU dimensions do not fit inside all HP cases.

[handmade--life]

Hi, thank you for good solution. I've run prodesk 600 G3 sff without issues. I have 7 pin with 5 wires where only grey (pwr good) and black (gnd) is necessary to start. As there still no solution to run ATX PSU in regular way (using 5v standby) we need to keep it running (keep connected pwr-on to gnd) before power button on motherboard is pressed. As today mostly all ATX has a switch there is not necessary to add extra one (but it is definitely cool :) )
To make process more convenient i bought special cable "24Pin to 6Pin Connector for HP Elite 8100 8200 8300" from aliexpress. It has 2 connectors: 6pin power and 6 pin data. From 6 pin connector we need to connect only 4 pins (black and yellow). In general it has: 2 yellow (+12v), 2 black(GND), standby +12v and -12v.

From data 6pin we need all 4 wires which are: gnd, gnd, pwr-good, pwr-on leaded to 24pin connector. I use jumper wire (like for breadbord ) to connect pwr-on to gnd. But to connect to mobo i had to cut 7 pin from stock PSU and solder grey and black to jumper wires which makes it very convenient to plug them into 6 pin data leads (gnd and pwr-good).

P.S. motherboard has non standard holes layout which doesn't fit regular ATX cases. To flip the case it is easier to disassemble stock case and install it's support stamped backplate to regular case using screws or rivets. I also soldered connector to mobo's power button and connected it to the case's power button.

P.P.S Case fans will run when PSU is on. To prevent it they need to be connected to sata power on mobo directly or use a relay to commute +12v from PSU to FANs. I use 5v arduino relay module which takes 5v and gnd from CD-rom cable.

[dimitris]

I am doing some designing for my own machine. I think we can solve the 12V standby by using a step-up converter to the ATX 5V output, and then connect it to the 4pin 12V pins with diodes just as a precaution to not let power get from the main 12V back to the standby circuits. We just have to increase the step-up V for the diode drop voltage, and make sure the converter and diodes are rated high enough to handle the current. I am also not sure why the psu was cycling when you connected the power-on wire directly to the motherboard. Was it doing the 5sec force-shutdown thing? Or was it releasing the pin from ground after a while?

[idtwrk]

I had just attempted this on my HP Envy desktop with the same exact PSU, and I could not thank you enough for testing/documenting this! Instead of mounting a switch to the front of the case, I opted to bridge the power on and ground directly, which hasn't left any issues. Also, did you end up having to add more fans to the case? Still, couldn't thank you enough!

[ВалентинМ-ыэ]

Thank you for the video! Please tell me, is it necessary to connect Power good and Ground to P2 motherboard to turn ON the motherboard? Maybe P2 can not be connected at all?

[lorenzomercadante]

I get 3 red beeps and 4 short white with a black screen any solution? thanks

[FarmYardGaming]

My brother has an M01-F1055na with the same(?) 7-pin PWRCMD P2 cable, and wants an upgrade to a new 600W PSU for a 3060 Ti. I think I'm starting to make sense of it, but... from what I can tell you have to wire the P2 cable to a 24-pin ATX cable and plug that into a power supply?

I think he's got just 1 4-pin, which starts at 8-pin in the HP PSU.

Annoying. I see lots of 24-pin ATX to 6-pin PWRCMD adapters on Amazon, could it be possible to convert a 7-pin to a 6-pin and make that work?

Aggravating that it's this ridiculous but here we are I suppose. I have a multimeter (but no idea where to check) so I'm not sure.

[Arfonfree]

Thanks. I was gifted a broken 10th gen i7 HP desktop. I got it working, but my investigation showed that the PSU was not adequate to supply the necessary current to the stock configuration under heavy loads. A 180 watt PSU in a system whose CPU can draw 227 watts! The voltage drop was sufficient to destroy several onboard components. I have zero desire to gift HP with the money for an upgraded power supply to fix a problem that they purposely (seemingly) create. I am still looking for an aftermarket supply with the correct pinout, but I would probably be better off following your procedure. At least then, when the computer dies, I might be able to salvage the PSU. Again, thanks.

[jdjdjd]

Hi. thanks for the infos you gave! Worked perfect for me. I changed a little bit and added a Relais on the 5V ATX Standby line to do the power good signal (grey cable at the ATX connector). So I do not need the second switch.

[davidross]

Thanks. I am working on an hp with a similar psu and was a little baffled why it was still supplying 12v when off. Will do a similar hack to get the motherboard use a standard psu.

[FreeBird-fzon]

hey man, good video. Im trying to figure out simply how to power an hp prodesk g3 600, without having to use the hardwired button on the mainboard. If you have any idea id appreciate it because i, m stumped! thanks

[WadayOG]

Have you found any way to get the standby to work without needing to use any physical switches or is the "ground" to "power on" cable still the only solution?

[nahomalphageek]

I was looking for these and couldn't find any help online and there are no adapters or custom wires for 7+4+4 pin conf.
Thank you.
Just wondering, is your method better than just using a second PSU for the GPU using add2psu board?

[aliS]

Hi my friend thanks alot for the video
One question i have an hp 400 g4 MT business pc
You know that 180 watt isn't good enough for GPU like gtx 1070 ti

The question is can I buy a normal ATX powersupply regarding the space and power up my hp pc or this will make my pc fried?
There is an 4pin P1
4pin P3 i guess
7pin p2

[rianhariyawanndaccount]

Did this method will work with HP Elitedesk 800 G4 SFF? I planned to transfer whole motherboard from it's original SFF case to regular PC case, and then I wanna try replacing it's original 250W PSU with regular ATX PSU with larger wattage. I really don't have enough budget to build another PC from scratch😢
Oh and my original 250W PSU have 7 wires on them, different than yours in the video.

[warfighter]

Im trying to swap psus for another 550 watt small form factor itx psu. Is the 7 pin necessary for thr pc to work cause i. Using a hp slimline mo1. Was hoping to use both cpu 4 pin and the other 4 pin and call it a day. Please respond if possible

[JSLantz]

Is the on and off switch absolutely necessary?