When I start my client, it sometimes runs some benchmarks. I wonder how the information obtained from running the benchmarks are used?

Also, my CPU will throttle back if it gets too hot, and it does tend to run hot. This means that when BOINC projects are running, the CPU will slow down to avoid overheating. So, I have to wonder if the benchmark information actually reflects how the computer performs when running BOINC tasks.

As far as I know, benchmarks just help determine how long tasks will take.

All CPUs have a built in overheat protection that slows them down, or even shuts off when they get too hot. You can use utilities like Core Temp to monitor the temperature, and even set your own overheat protection.

I think benchmarks might help BOINC manage tasks, because it can tell if the task can be completed in time. There might be other uses, but if they are they would vary by project.