CPU-Z is an app that shows a PC's hardware specifications, providing in-depth details about the CPU in particular. It also comes with a CPU benchmark, and although it's not nearly as popular as Cinebench, it's still popped up in some reviews and even AMD's marketing slides. However, technical analysis site Chips and Cheese has found that CPU-Z's benchmark just isn't perfect for evaluating the best CPUs.
CPU benchmarks can test lots of different things because there's so much to a CPU on a microscopic level, and so other benchmarks give different rankings. But what a benchmark doesn't test can also be necessary, and that's the critical issue with CPU-Z's benchmark, according to Chips and Cheese, as it doesn't adequately test cache or branch prediction.
