Phoronix published a review on the Athlon II X3 vs. Ryzen 3: How AMD's Performance Has Evolved & Performance-Per-Watt

A quote from the article:

Noticing I had an AMD Athlon II X3 425 system still racked up and hadn't been powered on in a long time, I decided to decomission it, but not before running some final benchmarks on that system. Having the recent AMD Ryzen 3 1200 / 1300X CPUs I decided it would make for an interesting comparison how the old Athlon II X3 compares to AMD's low-end CPU of today, the Ryzen 3 processors based on Zen. Here are those benchmarks that also include performance-per-Watt and overall AC system power consumption numbers.

 Athlon II X3 vs. Ryzen 3: How AMD's Performance Has Evolved & Performance-Per-Watt @ Phoronix