Ansys Employee

Do you have hyperthreading turned off? If that is the case, the number of threads will be the same as the number of cores. (which is recommended).

Looking at the spec sheet, if you have 2 physical Xeon E5-2670 CPUs, you should have 16 cores (with hyperthreading turned off), so if you can't use more than 8 core it might be due to the fact that you might not have enough HPC licenses to run the said run.