So my insomnia finally paid off, and while browsing for a 7900 GRE at 2am I saw a 7900 XT Nitro+ for 8 quid new on a big retailer site (so I don't feel too guilty, listing was removed a couple of hours later), bought it and its on its way to me now.
So assuming its not a brick (will video me opening it just in case it is.. lol), I was wondering if I will be able to use it on my Thermaltake 630w PSU with a 5800x if I enable its silent/low power bios until I can get something better sorted? I don't really want to order a PSU ahead of time in case I do receive said brick