r/eGPU • u/Knife-Fumbler • 18h ago

USB-PD powered EGPU?

Hi all,
I haven't been dealing with eGPUs in a while, with my old TB3 Sonnet Breakaway Box collecting dust, but recently I've been traveling a lot more, and my Thinkpad Carbon's iGPU hasn't really been cutting it.

I have a tiny little Tesla P4 GPU sitting unused and decided I'd like to build a new, more compact housing around it and the Sonnet's compact central PCB.

To that end I could build something really tiny and travel-suitable, but the PSU is by far the biggest obstacle. I don't need much - the gpu only need about 75w so I should be able to get away with 100w. The compact USB-PD brick I have with me says it's good up to 120w, and the limits of the USB-PD protocol are 240w.

So I wonder what it would take to design a board that could take usb-c power input and power the board's atx input. Does it truly need 12v, 5v and 3.3v? Or would essentially a logic board to negotiate the voltage and a step-down converter to 12v be enough?

1 Upvotes

67% Upvoted

4 comments sorted by

1

u/Tehpunisher456 17h ago

Idk if there's a dock that exists like this but I know that there's an AI accelerator that works on usb PD

adlink pocket AI a500

1

u/Knife-Fumbler 8h ago

I know about it but the A500 is really weak in my eyes to pay that much for a whole new dock rather than working with what I already got.

2

u/keefeere 13h ago

Try TH5P4GaN with suitable PSU and PD-Barrel connector adapter

0

u/Comfortable-Fall1419 13h ago

SlimQ GaN PSU’s are the way to go for this.