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PSU for exp gdc?  

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Foxsauce
(@foxsauce)
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Joined: 2 months ago
 

Hi everyone. Recently I decided to install a eGPU on my laptop aspire es 15 with NGFF using the exp gdc adapter and found out it has a AC/DC input and since I don't have an ATX psu at home I would like to try with that port. The thing is the only DC adapter I have is from my ps2 with 8.5v and 4.5 A. Given that I wanted to ask if it safe to use that to power up the exp and the graphics card which is a GTX 750, or should I directly get an ATX or the dell da-2?

Thanks in advance.

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


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

@foxsauce

You need a 12V power supply.

The 5.5x 2.1mm barrel connector is only safe up to 150W.
https://geekworm.com/products/exp-gdc-pcie-pci-e-laptop-external-independent-graphics-card-adapter-docking-stations

Check the power requirements for the GTX 750. It might only need 55W?
https://www.techpowerup.com/gpu-specs/geforce-gtx-750.c1986

Go with 12V 100W DC 

100W/12V = 8.3A.

 

Mac mini (2018), Mac Pro (Early 2008), MacBook Pro (Retina, 15-inch, Mid 2015), GA-Z170X-Gaming 7, Sapphire Pulse Radeon RX 580 8GB GDDR5, Sonnet Echo Express III-D, Trebleet Thunderbolt 3 to NVMe M.2 case


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Foxsauce
(@foxsauce)
New Member
Joined: 2 months ago
 

@joevt

Thanks for your answer. Unfortunately I don’t have many options for 12v and 100w around here, all of them with barrel conector are 19,5v and only generic ones have a switch for 12v but I don’t consider them reliables. I was considering getting one online and I checked many users talk about the dell da-2, would that one do the job or will it be a little bit over powered?

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


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joevt
(@joevt)
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Joined: 2 years ago
 

@foxsauce

No such thing as overpowered (unless it has higher voltage than required). A power supply has a certain voltage measured in volts (V) (example 12V). A load (GPU) connected to a power supply takes current (I, measured in Amps (A)). Power used is P = I x V, measured in Watts (W). The Dell da-2 has a maximum wattage where the current used by the load should not exceed 220W/12V=18.3A.

A load is like a resistor, it has resistance (R measured in ohms Ω). The higher the resistance, the less current that is used (I=V/R). If you connect something with low resistance like a wire to a power supply, the current is high and things will melt.

 

Mac mini (2018), Mac Pro (Early 2008), MacBook Pro (Retina, 15-inch, Mid 2015), GA-Z170X-Gaming 7, Sapphire Pulse Radeon RX 580 8GB GDDR5, Sonnet Echo Express III-D, Trebleet Thunderbolt 3 to NVMe M.2 case


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Foxsauce
(@foxsauce)
New Member
Joined: 2 months ago
 

@joevt

So that means I have to also pay attention the current and resistance. Is there a way to checks their ohms and amps or we can assume they’re at safe values considering the exp gdc and gpu?

the dell da-2 is plug and play with the exp gdc, right?

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


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

@foxsauce

You just need to know watts and voltage for the power supply and watts for the graphics card.

PSU Voltage is 12V and PSU Watts is greater than GPU Watts.

google "ohm's law formula wheel"

The Dell DA-2 has a 8 pin power connector that connects directly to the exp gdc.

Mac mini (2018), Mac Pro (Early 2008), MacBook Pro (Retina, 15-inch, Mid 2015), GA-Z170X-Gaming 7, Sapphire Pulse Radeon RX 580 8GB GDDR5, Sonnet Echo Express III-D, Trebleet Thunderbolt 3 to NVMe M.2 case


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Foxsauce
(@foxsauce)
New Member
Joined: 2 months ago
 

@joevt

Alright, thank you for your answers and time. They've been of great help to me.

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


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