5080 on a dell 750w supply?

Per title! I'm thinking of upgrading the 3080 10gb in my Dell XPS8950 to a 5080, but I've only got a 750w power supply (750W Night Sky Platinum PSU with ODD, per the invoice). Now, I've heard that in most cases the 750 watt supply is actually ok, *but* I've got an i9-12900k, so we're looking at a pretty hefty draw. It's worth noting that whilst I do game, I also do a lot of rendering and converting video and audio (largely 1080p but occasionally 4k) for work - that's the primary reason for the potential upgrade. Whilst I could replace the PSU, i believe it's a Dell proprietary one and third party units aren't straight swaps.