A cheap 220W PSU causes PCE164P V008 Power Failure
 
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A cheap 220W PSU causes PCE164P V008 Power Failure  

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Faustino Aguilar
(@faustino_aguilar)
Active Member
Joined: 2 months ago
 

Here I'm telling my story about my first eGPU, so it may help people to not repeat my mistakes.

My current pc is a Dell Inspiron 14 3442 FHD mod with a 3543 i5-5200U motherboard, 8GB RAM with PCI Gen2x1 WLAN mPCIe port. I have no money to build a full desktop so I decided to try a eGPU using the cheap (11 USD) PCE164P V008 mPCIe adapter. Then I found a used MSI RX 550 4GB OC on eBay for 50 USD. The issue began when I wanted to recycle a 220W PSU from an old office pc.

So my setup was:

  • Dell Inspiron i5-5200U (laptop)
  • 8GB RAM (laptop)
  • 240GB SSD (laptop)
  • MSI RX 550 4GB OC (eGPU)
  • PCE164P V008 mPCIe (eGPU)
  • 220W PSU (for eGPU)

All assembled and connecting the sata to 6 pin power cable adapter included with the PCE164P I started using my eGPU.

First I tried Halo MCC, Crysys Warhead and GTA V at 768p monitor 60fps and after a couple of minutes I noticed a heat coming from my custom cardboard eGPU box.

The sata connector and the PSU were super hot. So, I decided to shutdown all and research more about my setup.

Seems SATA cable is rated for a theoretical maximum of 54 W. So I disconnected the adapter and mod my PSU to create a 6 pin header.

It worked at first but after a hard shutdown mistakenly done by my brother it damaged something in my PCE164P, my GPU and laptop were ok.

I'm a lucky guy, that crappy PSU mod could had trashed my entire setup and even burn my house.

Finally, I got a better 500W PSU and tried all again, the damaged PCE164P  couldn't deliver more than 35W without crashing my GPU, so I had to underclock my RX 550 by -40% (25W) to avoid crashes until I get my new PCE164P.

So, never be cheap on PSU. Get a good PSU with 6 pin PCI header and connect it directly to the PCE164P 6 pin port.

Happy holidays! 🙂

This topic was modified 2 months ago

Dell Inspiron 14 FHD 3442 mod with 3543 i5-5200U motherboard. 8GB RAM. eGPU PCE164P V008 MSI RX550 4GB OC. PSU 500W.


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

I don't think the PCE164P is supposed to supply 75W to the x16 slot. It has only an x1 connection to the computer, so 75W is not an option.

An x1 connection should only require 10W (maybe 25W after negotiation with the computer?). Should do some research with pciutils to be sure...

Most of the power required by a GPU comes directly from the PSU through the GPUs 6 or 8 pin connectors.

http://mine2themax.com/best-mining-riser/#tab-con-11

What connections did you make on the PCE164P and the GPU and the PSU? What was connected to what using what cable? Maybe something was not correct.

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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Faustino Aguilar
(@faustino_aguilar)
Active Member
Joined: 2 months ago
 

@joevt

Thank you for your reply to my post!

The GPU RX 550 doesn't use external power connectors, it gets all its power from the pce164p x16 pcie slot.

Posted by: @joevt

An x1 connection should only require 10W (maybe 25W after negotiation with the computer?)

Oh, I didn't know that, this is a nice thing to know.

After researching a little bit more, I discovered my PCE164P has a burn fuse because overvoltage:

 

Dell Inspiron 14 FHD 3442 mod with 3543 i5-5200U motherboard. 8GB RAM. eGPU PCE164P V008 MSI RX550 4GB OC. PSU 500W.


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

@faustino_aguilar

Maybe not a good idea to use a GPU that doesn't have external power connectors with a riser. TDP of RX550 is 50W
https://www.techpowerup.com/gpu-specs/radeon-rx-550.c2947

I did sudo lspci -vvvv on my MacPro3,1 and found some devices that want 25.000W (ASM1142 USB controller, Thunderbolt controllers). Nothing was asking for 75W.

On my Macmini8,1, I found three slots that can provide 75.000W and the rest can provide 25.000W or 10.000W. For devices, the NVMe gets 25.000W, some related (T2?) Apple devices also, Wifi and Ethernet devices get 10.000W.

Probably should read the PCIe spec to see what those numbers mean.

 

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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