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SAFE? Using external psu hot wired to pc chasis power button to turn psu on?

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Hi,

I would like to get your advise regarding my future project for my old G20AJ,


Currently running with stock power supply for GTX 745.


Is there any thing i have to be aware of if I have to pursue this project?

 

Do i need to make grounding cable for my gpu/psu rack & swap jumpers on my motherboard.

 

Like how others changed the jumper when using two power supply for the G20?

 



Last, is it safe to use a external PSU to run my GPU? Connected by a PCIE extension and powered on via PC chasis power button?

 


Things to do.

  1. Use 300 mm PCIE riser cable from thermal take. Will this be long enough? or Should I use 600mm?
  2. Use external GPU/PSU mounted on rack. Will be using 650 w PSU solely for the gpu.
  3. Wire the on/off jumper for external GPU directly from the G20AJ power button.

 

 


Thanks in advance!

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19 minutes ago, gengaku_kurasaki said:

Wire the on/off jumper for external GPU directly from the G20AJ power button.

Case power switches are momentary; PSU require continuous contact. Won't work.

 

You're better off using something like this or this (preferably) to trigger the second PSU. You'll need to run at least the two wires on the secondary plug to your second PSU.

 

23 minutes ago, gengaku_kurasaki said:

Use 300 mm PCIE riser cable from thermal take. Will this be long enough? or Should I use 600mm?

The longer the cable, the more likely that electrical noise will become an issue, which can be really tough to troubleshoot and fix.

 

24 minutes ago, gengaku_kurasaki said:

Will be using 650 w PSU solely for the gpu.

Probably overkill. Even a 2080Ti has a 250W TDP, and there's no system you're powering besides it.

 

26 minutes ago, gengaku_kurasaki said:

Do i need to make grounding cable for my gpu/psu rack

As long as everything is grounded to its respective PSU, you'll be fine.

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