The device needing more power won’t get it, simple. Depending on what device it is, it will automatically throttle down so it needs less power, but obviously it will also deliver less performance while so throttled. And if the power is missing during a very sensitive part of a process so there’s no time to throttle down, your PC could blue screen or restart.
It’s very unlikely to suffer any long-term damage from this.
Is there another option?
Like if you don’t have at least 1kW PSU what happens when you need more power
The device needing more power won’t get it, simple. Depending on what device it is, it will automatically throttle down so it needs less power, but obviously it will also deliver less performance while so throttled. And if the power is missing during a very sensitive part of a process so there’s no time to throttle down, your PC could blue screen or restart.
It’s very unlikely to suffer any long-term damage from this.
Yes, but the truth is unfunny