the power supply does not work if it is not connected to the motherboard?I wanted to use the second power supply for VGA, is there a way to make it work?

Thank you very much and sorry for my ignorance on the subject

I use this

You just need to jumper the psu with a paper clip and it will work for a secondary psu that you can use on any gpu. I have done this many times since forever for Quad crossfire and quad sli. Watch this video and follow the same things he does. I hope this helps.

 

Regards: Angelo

 

 

 

A thousand thanks

Paper clip 😉

I would reccomend additional ground tie between PSUs though

13 minutes ago, TerraRaptor said:

I would reccomend additional ground tie between PSUs though

Wanted to say the same thing; make sure they share the same ground connection, the last thing you want is killing your GPU because ground potential differences are putting negative voltages on your GPU. Also make sure you put them on the same circuit to be safe, you don't want your PSU to run out of phase of each other.