The PSU is the boring part until it fails, or until a new GPU needs clean power the old unit cannot give. Quality and connectors matter as much as the wattage sticker.
Tiny no-name supplies are a common cut on cheap prebuilts. They can limp along for months, then brown out under load. That is predictable risk, not bad luck.
When we build or upgrade, we size the supply for the real hardware with headroom. Planning a GPU jump? Ask us to check the PSU before you order the card.
Not sure what you need?
Pick a path, run Find my PC, or message with your games and budget. We will keep it practical.