Phoronix published a review on the Comparing Today's Modern CPUs To Intel's Socket 478 Celeron & Pentium 4 NetBurst CPUs A quote from the article:

With Phoronix having turned 11 years old last week, there's been several interesting articles looking at the historical performance of Linux, large GPU/driver comparisons, etc. Today is arguably the most interesting birthday article yet. I dug out an old Intel Socket 478 system with the i875p Canterwood chipset and Pentium 4 and Celeron CPUs that still manage to power up. I compared the Linux performance of this 11+ year old system to a variety of today's x86 and ARM systems. Beyond looking at the raw performance, the performance-per-Watt was also measured to make for a very interesting look at how CPU performance has evolved over the past decade.

 Comparing Today's Modern CPUs To Intel's Socket 478 Celeron & Pentium 4 NetBurst CPUs @ Phoronix