Im wondering if I buy better video card and my PSU is too weak, can I just conncet my video card to PSU that I have in my old PC that i dont use anymore, or something bad will happen if all parts will not be on same PSU?
Yes you can connect you video card to another PSU
Yes you can...
... but it is not recommended.
You would have to start the PSU-s at the same time.
Better buy a decent PSU.
It's possible, but you shouldn't do it. Just get a better PSU now and not worry about it later.
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