Energy efficiency of 5090 is slightly worse than 4090

Despite the big jump in energy efficiency in the previous two generations. Nividia dropped the ball this time. It is only saved by the higher VRAM size and significantly higher memory bandwidth.

Some might attribute the energy efficiency gain can be constrained by smaller transistor size. But if you look at the 96W MacBook Pro 14in using the Max chips, their energy efficiency gain is steady. The only conclusion is that Nvidia did a poorer job at chip design going from 4090 to 5090.