Should I upgrade from a 750w PSU to a higher capacity for the Ryzen 9800X3D and 7900 XT?
Should I upgrade from a 750w PSU to a higher capacity for the Ryzen 9800X3D and 7900 XT?
The title clearly indicates the situation, along with additional details about the equipment and goals.
The PSU in your setup is a Corsair RM750. It is currently 10 years old and has powered your build throughout its entire lifespan. The RX7900XT's make and model are not specified in this context.
My GPU is a XFX Speedster MERC310 AMD Radeon™ RX 7900XT and the PSU I purchased in late December 2021 is now almost three years old. It has typically used around 500 watts during peak times, but I estimate the average usage would have been about 300 watts, sometimes reaching 400.
750W is more than sufficient.
A solid PSU is designed to deliver 750W consistently. That's what "continuous rating" means—it indicates the device can maintain its full capacity without interruption.
The only PSUs you need to be cautious about are those with misleading labels or specifications, such as warnings like "reduce output by 10% above 40°C ambient temperature."