Question about XFX RADEON RX 7900 XTX MERC310 BLACK GAMING

So, I got the card today and it is going back to Digitec this week --- why ? Well, the cards offered here are the Speedster series from XFX, which on the one hand require 850W power supplies and 3x 8pin connectors, not 750W / 2xpin as stated - plus the TDP is not 320W but 355W. The card would certainly be good and would fulfil your purpose, BUT I am not willing to buy a new power supply for around 150 to 200.- in addition to 1349.-, because I can get an RTX 4080 and would have significantly more ray tracing performance. My reason for buying this not exactly cheap GPU was that I would NOT have to buy a new power supply, but this is now invalid and I am very disappointed.