Question Help running a 2 psu setup??

Aug 30, 2019
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So im planing to build a mid-lvl gaming setup and got my hand on a second hand rx 480 8gb
The problem is the rest of the components wont be here for a while and i need to test the graphic card for any noticable artifacts or sign of it not working

I have a 650 evga psu with 3xpin pcie connectors which should be plenty for an rx 480
But ive heard its pretty risky running two powersupplies setup so im here for a guid on how to do it proparely

Is it a matter of just shoreting the second psu so i can the graphic card out of my evga or does it evolve more steps??