The 7900XTX needs 3 such (and Sapphire also specifies 800w minimum). Wasn't totally sure what forum to ask in, but this seems a shade more video related - suggestions on PSU to buy? I am not sure ...

With the release of the 5000 series graphics cards from Nvidia, comes the release of new prebuilt gaming desktops, and today we assess the Cortex Pro from PCSpecialist. It features an RTX 5080 ...