stupid HP psu from a small form factor case

DavidKalinowski · December 9, 2019

I've got a HP Z220 small form factor workstation, it works like a champ, but I was wanting to throw a dedicated gfx card (say a Geforce GTX GT550ti that I have laying around) into it for a basic gaming system for my sons friends when they come over so they can team play on fortnite and roblox. so I was going to throw it into a full size case and slap a standard size ATX psu on it.. NOPE HP is using some weird ass PSU voodoo on this thing.

this https://drive.google.com/open?id=1CiZoWsSdEpRectyyi6adwrgTwUEJRozl

and then this one https://drive.google.com/open?id=1CfoXCKEcgNKT19rPYJhVE9M_tdeDyCWU

I don't have a volt meter (that works worth a damn) or i would just figure out what the volts are and just wire something up. I can't find any good info on this set up. does any one have the pin outs for this? I've never in all my years of messing with/building PCs have I ever came across this type of PSU. (and its been 24 years.. other HP small form factors I've messed with where standard 24pin ATX connectors.) I'm assuming its because its a business unit that they wanted to make sure no one could just easily upgrade it.

Any ways its not a critical issue, I can get a decent tower from my work for $25 that is is a standard unit but I had this already. Thanks to any one that has any ideas or input.

mariushm · December 9, 2019

You can buy adapter cable that converts regular atx 24pin to those cables the motherboard needs: https://www.moddiy.com/products/HP-Z230-Z220-PSU-Main-Power-24-Pin-to-6-Pin-Adapter-Cable-30cm.html

The cable is also on eBay just search for "z220 power supply adapter" or "HP 24 pin to 6 pin adapter cable" and make sure the description includes Z220

Pinout MAY be this. Best to double check the voltages with a multimeter.

I suspect the adapter cable contains a tiny microcontroller or something under that heatshrink (the black bit in the middle) which fakes the power supply rpm sensor of the psu, so you won't get bios warnings about power supply fan not working.

You also need a step-up (dc-dc converter) to boost the 5v stand-by to 12v stand-by (the purple wire in the picture, pin 6)... example regulator: https://www.ebay.com/itm/DC-3-3V-3-7V-5V-6V-to-12V-Boost-Voltage-Regulator-Converter-Step-up-Power-Supply/271812105443?hash=item3f494394e3:g:tjAAAOSwUwlbAk8l