Most PSUs are rated at 25°C (room temperature). But inside a gaming PC case, the ambient temperature can easily hit 40°C or 50°C. A "600W" power supply running in a hot box might effectively become a "450W" power supply because the capacitors are cooking. This is why high-end units are over-engineered; they are built to sustain their rated wattage even while being baked at 50°C.
Several factors affect the power supply wattage required by a system: pc power supply wattage
If you buy a 650W PSU for those two components, you will likely run into trouble. Most PSUs are rated at 25°C (room temperature)
If you look at the box for an NVIDIA RTX 4070, it might recommend a 650W PSU. If you look at an Intel i7-13700K, Intel might suggest a "253W peak" power draw. This is why high-end units are over-engineered; they
Here is an "interesting piece" on PC power supply wattage that breaks down why the number on the box is rarely the number you get.
Here is a piece of physics that marketing departments hate: