Want to see just how big the difference is between your old AMD K6 and a newer Athlon? You can't beat [this guide](https://web.archive.org/web/20030000000000*/https://www.tomshardware.com/cpu/20030217/index.html) over at [Tom's Hardware](https://web.archive.org/web/20030000000000*/https://www.tomshardware.com). It's a huge but great read.