GPU riser with external power supply for...
 

GPU riser with external power supply for HP ProDesk  

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freezoid
Posts: 5
(@freezoid)
Active Member
Joined: 2 months ago

Hello.
Simple question (or not?).
Could I use GPU riser for HP small form factor computer and power the graphic card using Dell d220p-01 power supply? (220W)

I got all of the above parts and I'm just wondering if it's going to work without burning the motherboard because its not so easy to find a replacement.
PC: HP Prodesk 600 G2

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Cardfire
Posts: 40
(@b_wesley)
Eminent Member
Joined: 3 months ago

The Dell PSU powers your GPU and PCIe Riser.

If you plug those in correctly, it will not burn your motherboard
The Motherboard lives in your desktop chassis and has its own power supply. 🙂

Do you know what GPU and Riser you'll be using?

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freezoid
Posts: 5
(@freezoid)
Active Member
Joined: 2 months ago

The thing is that HP PSU is only 200W  if I remember well. Not more than that for sure.
So if I connect something like GF 1080 to the riser I will need to feed it through those 6/8 pin power connectors. And that's why I thought of using that dell power adapter.

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Cardfire
Posts: 40
(@b_wesley)
Eminent Member
Joined: 3 months ago

HUH, GTX 1080 has maximum power draw of 180w. TIL. 
Just don't OC as that's right on the margins, accounting for PCIe Riser power overhead and accounting for the PSU brick being 13 years old or so.

Dell DA-2 PSU --> PCIe Riser & GTX 1080
HP PSU --> HP Pro.

Passively powered data cable between the two. Just don't lick anything and it should be fine?

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freezoid
Posts: 5
(@freezoid)
Active Member
Joined: 2 months ago

Well the reason for my concerns is I already killed one pc in the same setup.
The cause probably was that I did not power up the Dell power adapter (by connecting remote to the gnd). Still though this should not damage the motherboard...

Can I power the riser with HP PSU and the GPU with Dell?

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Cardfire
(@b_wesley)
Joined: 3 months ago

Eminent Member
Posts: 40

Unwise to power Riser (+ 75 watts of available electricity) from HP's power supply, and then to feed just the GPU with the DA-2.

Then you would have two different PSU's directly powering the GPU, without shared ground. Don't do that. 🙂
I'm convinced you need to connect the  Remote/Ground and then just use just the DA-2 for your Riser/eGPU.

If you want something more elegant than the $3 guide you can fit all the pinned parts into a 20-pin ATX female connector. For my first custom harnesses I bought a 24-pin-to-20-pin ATX adapter as well as a PCIe Y-splitter and instantly had all the pinned cables I could need to complete the adapter.

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