How to evaluate performance impact of more than 8 vCPU assigned to a VM with vSphere evaluation mode

Hello,

I wish to evaluate the impact on performance of  the number of vCPU assigned to the VM hosting an application.

I reinstalled the ESXi server in evaluation mode to have Entreprise plus evaluation licence but I am still limited to 8 vCPU/VM

Is there a way to evaluate the impact of an Enterprise or Enterprise plus licence on performance?

Thanks