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Use Exp Gdc with laptop Power Supply 12v
 

Use Exp Gdc with laptop Power Supply 12v  

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Thierry
(@thierry)
New Member
Joined: 12 months ago
 

Hi guys, im building now a eGPU with my HP Elitebook 2560p expresscard, so, i want to use a GTX 750ti or 1030 or another low proffile graphics card with low power consuption, so,  can i use a 100w laptop power supply connected to the 12v exp gdc?

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


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Yukikaze
(@yukikaze)
Prominent Member Moderator
Joined: 3 years ago
 

If the laptop power supply outputs 12V, yes, you can. A lot of laptop power bricks are in the 16-20V range, however, which you really want to avoid, unless you enjoy the smell of burning electronics.

This post was modified 4 weeks ago

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Thierry
(@thierry)
New Member
Joined: 12 months ago
 

@yukikaze

Thank you, i forgot to ask about ampere, becouse there Is diferentes laptops Power supply with diferents amperes config, i need tô be Carreful about
that?

This post was modified 4 weeks ago

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


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Yukikaze
(@yukikaze)
Prominent Member Moderator
Joined: 3 years ago
 

Watt's Law indicates that Watts = Volts * Amps. Which means that if your power supply is 100W and is outputting 12V, it must be rated at 8,33A.

In short, if your brick is 12V and 100W, you don't need to worry about Amps.

Want to output [email protected] out of an old system on the cheap? Read here.
Give your Node Pro a second Thunderbolt3 controller for reliable peripherals by re-using a TB3 dock (~50$).

"Always listen to experts. They'll tell you what can't be done, and why. Then do it."- Robert A. Heinlein, "Time Enough for Love."


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joevt
(@joevt)
Honorable Member
Joined: 2 years ago
 

GTX 1030 only needs 30W and doesn't have any PCIe power connectors.
https://www.geforce.com/hardware/desktop-gpus/geforce-gt-1030/specifications

GTX 750 Ti requires 60W.
https://www.geforce.com/hardware/desktop-gpus/geforce-gtx-750-ti/specifications

HP Elitebook 2560p laptop power supply might be 18.5V so it can't be used for the exp gdc.
https://support.hp.com/ca-en/document/c02852909

Correct me if I'm wrong, the Exp GDC has two power inputs - the 12V barrel connector works with up to 150W. But if you have a card that requires more, then you should use the 8 pin power input connector (220W) (because the barrel connector is not made for more amps).

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


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Thierry
(@thierry)
New Member
Joined: 12 months ago
 

Thank you very much guys, when i do it , i will put the photos in the guide becouse i dont seen a tutorial with 12v power supply with EXP GDC, and its a good choice because it cost around USD 7 in Brasil.

I forgot to ask, about the GPU, there is two differents GPUs, one that use power by the power conector and there is others that use PCIE as a power supply.

Do you think that is a problem? for example, the GTX 750 ti, have to many versions, in the past i used 1 model that have power conector, and other that uses the PCI Power.

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


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Yukikaze
(@yukikaze)
Prominent Member Moderator
Joined: 3 years ago
 

@thierry - It should not matter as long as 100W are enough for the card. An easy to way to be sure that it is sufficient is simply to not get a GTX750Ti that has a power plug in the first place 🙂

If you do want to feed power to the 6-pin on the card, the GDC Beast has a 6-pin output that can be used to feed a 6-pin PCIe power input. You will need to use a 6-pin male to 6-pin male PCIe power cable if your GDC Beast did not come with one (this varies by seller).

Want to output [email protected] out of an old system on the cheap? Read here.
Give your Node Pro a second Thunderbolt3 controller for reliable peripherals by re-using a TB3 dock (~50$).

"Always listen to experts. They'll tell you what can't be done, and why. Then do it."- Robert A. Heinlein, "Time Enough for Love."


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