The PS5's GPU is nearly eight times more powerful than the PS4 and two and a half times more powerful than the PS4 Pro, according to that single number. Because of the PS5's 36 CUs and faster clock speed, Sony is able to reach such high performance. The PS5's cores run at 2.23GHz with variable frequency, which is faster than the PS4.
While a faster clock speed is predicted, flexible frequency is what we're after. The maximum speed is 2.23GHz, although it may be lower depending on the GPU's requirements. The PS4's clock speed is fixed at 800MHz, although it varies power based on workload to meet it. Power is required for more demanding games, while the speed remains constant at 800MHz.
Power is the con for the future generation.