The Sandy Bridge Core i7 3960X Benchmarked Against Today's Six-Core / 12 Thread AMD/Intel CPUs
In demanding tasks like video encoding, today's CPUs are a great deal faster especially with having AVX2.
Building the Linux kernel on the Core i7 3860X tookover four minutes while the Ryzen 5 3600X and Core i7 8700K took less than a minute and a half.
The performance is a dramatic difference even for desktop workloads like GIMP.
Of course, the difference is more profound in demanding scientific workloads like Rodinia.