How concerned should I be that my psu isnt even listed?
Sentey MBP750-HM
I guess that all depends on what you're doing with your computer.
Unfortunately I'm the furthest thing from an expert on PCs, especially PSUs. I just jumped back into PC gaming a few weeks ago after a 6+ year break and that was on a gaming laptop. The last time I built a computer was around 10+ years ago lol. Do keep in mind that link is to another forum post, not an actual article. However the list is referenced in an actual article and they suggest not to have anything lower than a tier 2 level PSU for overclocking.
With the boost technology we see in these cards, I'd apply that rule even if you don't manually OC. However I could be entirely wrong there.