Yea I think if you run the calculations and you have room you should be good if your PSU is just slightly above the power requirements. If you run an unusual amount of memory or HDDs/etc, you might want to calculate everything manually rather than just assume its 100 watts though.
I have never had a PSU fail, but supposedly unlike pretty much every other component if it fails its possible it will destroy your GPU/CPU/MB so it makes sense to spend a little extra on a good PSU.
Probably my best component purchase ever was a 1050W Modular PSU in 2014. It was an old model even then and apparently no one wanted 1000W+ power supplies back then because it was on clearance. It should still be good for a 3090 and probably even a 5090 when I upgrade again in the future.
I have never had a PSU fail, but supposedly unlike pretty much every other component if it fails its possible it will destroy your GPU/CPU/MB so it makes sense to spend a little extra on a good PSU.
Probably my best component purchase ever was a 1050W Modular PSU in 2014. It was an old model even then and apparently no one wanted 1000W+ power supplies back then because it was on clearance. It should still be good for a 3090 and probably even a 5090 when I upgrade again in the future.
I paid far less than a 1000w PSU costs now.