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GPU riser with external power supply for HP ProDesk
 

GPU riser with external power supply for HP ProDesk  

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freezoid
(@freezoid)
Active Member
Joined: 4 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

Pending: Add my system information and expected eGPU configuration to my signature to give context to my posts


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B Wesley
(@b_wesley)
Eminent Member
Joined: 5 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?

Sys1: MITX Desktop in InWin Chopin
i5-4570 + 1060 6GB + PCIe 1x adapter (over USB3.0 copper)
Sys2: Dell 15 Latitude 3542
i3-4030U + 1060 6GB + mPCIe adapter for PCIe 1x (over USB3.0 copper)
Sys3:Dell 14 Inspiron E5450
i7-6500U + 1060 6GB + NGFF M.2 A/E --> mPCIe adapter
+ mPCIe adapter for PCIe 1x (over USB3.0 copper)
Sys4:Pending


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freezoid
(@freezoid)
Active Member
Joined: 4 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.

Pending: Add my system information and expected eGPU configuration to my signature to give context to my posts


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B Wesley
(@b_wesley)
Eminent Member
Joined: 5 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?

Sys1: MITX Desktop in InWin Chopin
i5-4570 + 1060 6GB + PCIe 1x adapter (over USB3.0 copper)
Sys2: Dell 15 Latitude 3542
i3-4030U + 1060 6GB + mPCIe adapter for PCIe 1x (over USB3.0 copper)
Sys3:Dell 14 Inspiron E5450
i7-6500U + 1060 6GB + NGFF M.2 A/E --> mPCIe adapter
+ mPCIe adapter for PCIe 1x (over USB3.0 copper)
Sys4:Pending


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freezoid
(@freezoid)
Active Member
Joined: 4 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?

Pending: Add my system information and expected eGPU configuration to my signature to give context to my posts


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B Wesley
(@b_wesley)
Eminent Member
Joined: 5 months ago
 

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.

Sys1: MITX Desktop in InWin Chopin
i5-4570 + 1060 6GB + PCIe 1x adapter (over USB3.0 copper)
Sys2: Dell 15 Latitude 3542
i3-4030U + 1060 6GB + mPCIe adapter for PCIe 1x (over USB3.0 copper)
Sys3:Dell 14 Inspiron E5450
i7-6500U + 1060 6GB + NGFF M.2 A/E --> mPCIe adapter
+ mPCIe adapter for PCIe 1x (over USB3.0 copper)
Sys4:Pending


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freezoid
(@freezoid)
Active Member
Joined: 4 months ago
 

Well I guess all I got to do now is to modify riser's power cable to be able to connect it to Dell power supply together with GPU.
Thanks for your help. I really appreciate how active you are in this topic.

Btw I'm not allowed to write private messages. Probably cause I'm still new on this forum.

Pending: Add my system information and expected eGPU configuration to my signature to give context to my posts


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B Wesley
(@b_wesley)
Eminent Member
Joined: 5 months ago
 

Ah, then you won't be able to reply to my private invitations to ship you a compatible wiring harness. Basically, I bought the Molex terminal crimper and have been crafting a few of the re-pinned cables in question. 

 

You can totally solder your own, or use twist-lock connectors to wire up your own, but the most elegant and least burning solution might be to pick up an ATX/Molex pin extractor and rewire a harness using that $3 guide instructions.  Feel free to contact me if you're interested in me mailing you one instead (I use the same SN 'CardFire') most everywhere ... 

Sys1: MITX Desktop in InWin Chopin
i5-4570 + 1060 6GB + PCIe 1x adapter (over USB3.0 copper)
Sys2: Dell 15 Latitude 3542
i3-4030U + 1060 6GB + mPCIe adapter for PCIe 1x (over USB3.0 copper)
Sys3:Dell 14 Inspiron E5450
i7-6500U + 1060 6GB + NGFF M.2 A/E --> mPCIe adapter
+ mPCIe adapter for PCIe 1x (over USB3.0 copper)
Sys4:Pending


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freezoid
(@freezoid)
Active Member
Joined: 4 months ago
 

Thanks but I'll try making one myself. Anyway it would cost extra because of shipping to UK.

Btw have you thought about using a relay to startup the brick when turning on PC? By connecting it to molex in PC for example?

This post was modified 4 months ago

Pending: Add my system information and expected eGPU configuration to my signature to give context to my posts


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B Wesley
(@b_wesley)
Eminent Member
Joined: 5 months ago
 

Honestly hadn't. Dumb cables is as creative as I'd grown to be, thus far, and I would just put the PC + GPU on a switched power strip if worried about it.

I generally leave machines on 24/7 so there aren't a lot of occasions where the desktop or laptop is off and the GPU is spinning away in idle.

Sys1: MITX Desktop in InWin Chopin
i5-4570 + 1060 6GB + PCIe 1x adapter (over USB3.0 copper)
Sys2: Dell 15 Latitude 3542
i3-4030U + 1060 6GB + mPCIe adapter for PCIe 1x (over USB3.0 copper)
Sys3:Dell 14 Inspiron E5450
i7-6500U + 1060 6GB + NGFF M.2 A/E --> mPCIe adapter
+ mPCIe adapter for PCIe 1x (over USB3.0 copper)
Sys4:Pending


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