I mean, if what you want is P4-class performance, the modern semiconductor industry is excellent at delivering that with low TDP. An Apple A18 Pro [1] gives you over 7x the single thread performance of a Pentium 4 Extreme Edition [2] at 8 W TDP, compared to 115 W for the latter.

[1]: https://www.cpubenchmark.net/cpu.php?cpu=Apple+A18+Pro&id=62...

[2]: https://www.cpubenchmark.net/cpu.php?cpu=Intel+Pentium+4+3.7...