Upgrade power supply to ATX in HP EliteDesk 800 G3 TWR

[cichy_misiek]

Hi,

I want to upgrade power supply to 650W ATX.

I'm looking for adapter ora adapter schema. I need pinouts of 7pin connector.

On the photo are original power 250W connectors.

P1_MB: 4xpin
P2_CMD: 7xpin
P3_CPU: 4xpin

The 4xpin connector I can check with multimeter. But 7xpins ....

Can anyone help me?

[DGroves]

there are currently no ATX power adapters for this model (G3) available commercially, however you might want to contact a maker of these products to see if they plan on releasing such a product

https://www.moddiy.com/products/HP-EliteDesk-800-PSU-Main-Power-24-Pin-to-6-Pin-Adapter-Cable-30cm.h...

[cichy_misiek]

I have reply from maker. They don't have this adapter.

I want to make this adapter but a need help.

I checked voltage with multimeter:

P1_MB: molex 4xpin
yellow: +12V
black: GND

P3_CPU: molex 4xpin
brown: +12V
black: GND

P2_power_CMD: 7xpin - from power supply board description:
red: FAN_CMD (this maybe empty, ATX power have own)
white: TAC1 (connected to 3 pin on fan connector - could be connected to 3 pin of CPU FAN connector)
black: RTN (GND)
green: PS_ON
gray: PSU_ID (lub PSU_IO) - in this place still is 2V
purple: Power_Meter
black: RTN (GND)

I need schemta how to connect  7pin connector to 24 ATX connector

[DGroves]

as i pointed out, no adapter/schematics  exists for this model pwr supply/motherboard and a wrong guess will result in a blown supply/fried motherboard

just "WHY" do you feel the need to change the power supply?

[Stemgh]

Did you end up finding a solution for this? I'm in the same situation. The machine is plenty powerful, but I'm interested in using a better graphics card than a GT 1030, which requires additional power.