According to https://www.vmware.com/resources/compatibility/search.php no server with those processors support ESXi 6.0 and above; 5.5 U3 seems to be the latest version. That doesn't mean you can't make it work, but you probably won't get support.
According to https://www.vmware.com/resources/compatibility/search.php no server with those processors support ESXi 6.0 and above; 5.5 U3 seems to be the latest version. That doesn't mean you can't make it work, but you probably won't get support.