Log RCC-eGPU2 | a tiny portable 0.6L Thunderbolt GTX 1650 eGPU

[SFFMunkee]

If possible, could you show me the exact wiring structure of the picobox power supply in a picture?

Luckily I happened to have it in a box in the cupboard - unfortunately the connectors had been stripped since last I used it.
As such, please do not judge me on the twisted/taped wires

Both connectors are wired with the positive voltage TOWARDS the clip as below:

 

[Harko]

@REVOCCASES
The Tmall link of nvme to tb3 you attached is no longer valid. Can you tell me the model name of the product?

 

[REVOCCASES]

It was an generic adapter. Any 40gbps TB3 NVME enclosure should work. For example from JEYI.

 

[milesvw]

Use two of these 12v battery holders (in parallel).

https://www.amazon.com/dp/B09N42RJKW/

Then this two pack of 6 Ah batteries with a charger

https://www.amazon.com/dp/B0CR32YLD1

If using this I would suggest an "ideal diode" Mosfet board. It basically switches to whichever battery has higher voltage. https://www.aliexpress.us/item/3256806118206706.html

Better yet may be a battery bank that will output PD 12v. Or a DIY version using 18v battery packs and a 'Solar' 100w PD power adapter and a PD trigger to get 12v. Then the voltage will be stable.
https://www.superbuy.com/en/page/buy/?url=https://item.taobao.com/item.htm?id=684086754983
https://www.aliexpress.us/item/3256805813121586.html

I would probably solder onto the board and just plug the male USB trigger in to signal 12v output.

 

[jhines97]

If using this I would suggest an "ideal diode" Mosfet board. It basically switches to whichever battery has higher voltage. https://www.aliexpress.us/item/3256806118206706.html

Better yet may be a battery bank that will output PD 12v. Or a DIY version using 18v battery packs and a 'Solar' 100w PD power adapter and a PD trigger to get 12v. Then the voltage will be stable.
https://www.superbuy.com/en/page/buy/?url=https://item.taobao.com/item.htm?id=684086754983
https://www.aliexpress.us/item/3256805813121586.html

I would probably solder onto the board and just plug the male USB trigger in to signal 12v output.

I don't really understand what you are linking to. I also figured I might need a voltage regulator like this one. (given the varying voltage from batteries) https://www.amazon.com/gp/product/B078Q1624B What do you think?

 

[codearm2]

hey @REVOCCASES
mind to share how to connect the pico psu's 8 pin to 24 pin found in oculink board? It's the same connector found on motherboard

 

[REVOCCASES]

hey @REVOCCASES
mind to share how to connect the pico psu's 8 pin to 24 pin found in oculink board? It's the same connector found on motherboard

Not sure... I don't know which PINs of the 24P connector are actually used / required on that board. I assume only 12V, GND and PSON but it's a wild guess...

 

[REVOCCASES]

on a side note, EXP GDC has some new ultra small eGPU models with integrated DCDC buck converter (up to 330W) - perfect to pair with a SlimQ 330W GaN (or similar)

for this price, it's almost not worth going DIY - just get one of those and design a custom case around it





OCuLink 显卡扩展坞 OCuP4GaN 搭载ReDriver信号增强 PCI-E4.0-淘宝网 (taobao.com)

 

[codearm2]

Not sure... I don't know which PINs of the 24P connector are actually used / required on that board. I assume only 12V, GND and PSON but it's a wild guess...

the pins marked with orange marks are needed
Do you have any idea how to do it using pico psu?

 

[REVOCCASES]

the pins marked with orange marks are needed
Do you have any idea how to do it using pico psu?

If so, the DCDC200 will not work.

Maybe try a normal DC ATX Plugin (Pico PSU)… that should work out of the box

 

[codearm2]

If so, the DCDC200 will not work.

Maybe try a normal DC ATX Plugin (Pico PSU)… that should work out of the box

Oh I see
Even when using step down?

 

[REVOCCASES]

Oh I see
Even when using step down?

the DCDC200 is a step down converter and only provides +12V and GND.... no 3.3V, 5V, PG, PSON, etc... if you need those PINs connected, you have to use a "normal PicoPSU"

 

[codearm2]

the DCDC200 is a step down converter and only provides +12V and GND.... no 3.3V, 5V, PG, PSON, etc... if you need those PINs connected, you have to use a "normal PicoPSU"

Alright, understand

Btw what if I want to use my 20v5a Gan charger to power up the 12v input "normal pico psu" (I can't find any normal pico psu that can take 20v)

Can I use a decoy to trick the gan charger to output 20v, then drop it down using a step down to 12v while retaining a full 100W? My card itself is 6400 so it will use around 50-60W

 

[REVOCCASES]

(I can't find any normal pico psu that can take 20v)

unfortunately there are very few reliable wide voltage Pico PSUs these days since HDPlex stopped production of their unit

Can I use a decoy to trick the gan charger to output 20v, then drop it down using a step down to 12v while retaining a full 100W? My card itself is 6400 so it will use around 50-60W

might work for the 6400, but I think it's not worth the trouble... doing my napkin math, that setup will end up more expensive (and larger) than just buying the EXP GDC OCuP4GaN (which I have btw, and I'm pretty happy with it)