Cooler Master's Master X Mighty 2800W and 2000W PSUs could power multiple RTX 4090s
Cooler Master highlights the X Mighty 2800, a 2800 Watt, 80+ Platinum, Modular Power Supply with dedicated cooling hardware and enough wattage to run 4 RTX 4090s with headroom left for efficiency.
Source: tomshardware.com