ATX PSU to DC-IN?

[viper_11]

Hi there,

I'm working by fun on the smallest mini-itx pc possible with mid-range gpu. The thing is:

I have an HDPlex 250w GaN, and I want to feed a thin Mini-ITX board with DC-IN and EPS 4 pin for cpu.

As concept: Will work if I short the PS_ON for power on the PSU and take the 12V line from PSU pin and connect to the DC-IN?
The GPU and EPS will be the standard cable from PSU to board.

Thank you.

 

[DASBOOT]

Not if the thin itx board is 19 volt, some are twin voltage, 12 and 19, some are 12, but most are 19V.

 

[GuilleAcoustic]

What motherboard, CPU and GPU are you going to use ? Might be worth checking the manual or with the manufacturer directly. For example, Asrock suggests those input voltages for their WV (wide voltage) lineup depending on what you plug in that PCIe slot :



Don't look at the >75W as it is for their newer motherboards that have a passthrough connector to a small additional board to provide the PCIe 8pins power to a GPU :

• https://www.asrockind.com/en-gb/VGA-PWR
• https://www.asrockind.com/en-gb/VGA-PWR600W

 

[viper_11]

The MB, I'm between 2 or 3 models. All with 12-24 range. (BCM MX610HD,
The GPU it's a RTX 5060 Ti with 90-100w peak (undervolt). It's pcie 8x.
The CPU 12400F with maybe sustaines 20-40w (gaming).

But my doubt is. If I use the standard PSU ATX connector for GPU and 4pin EPS, BUT, I took 12V line from the ATX 24 coonector to the DC-IC, jumping the PS_ON and after, jumping the MB for power on, will work?

 

[DASBOOT]

You said thin. Your GPU will need undervolting, and Turbo will need to be turned off. Most Thin ITX boards have a 65-watt max at the CPU.
Please review tech info on thin ITX boards here: thin itx info
The 12400F has a Turbo of 117 watts.
Your idea will work with the BCM board, but you will have cooling issues if you are gaming.

 

[viper_11]

Thank you for your answer.
I will consider. Maybe it's a bit on the line for my use.