What if installed a second power supply like 300 watt and only used it to plug into my graphics gtx 550 ti? would anything bad happen?
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Hi and welcome to Tom's forum.
What exactly PSU? A generic PSU can't handle that GPU.
Well, you would have trouble starting the 2nd PSU for one. Also, some PSUs don't take it well when there is no load on the ATX (20 or 24-pin) connector. They may seem to work, but they would get damaged much sooner.