Windows 2008 R2 VM showing 7 CPUs in Device Manager.

Hi,

I have 1 windows 2K8 R2 Std VM in our ESX infrastructure, when I right click the task manager it is showing 4 vCPU's but at the same time when I checked the device manager of the VM it is showing 7 CPU's, So I would like to get small clarification on the CPU configuration.

1) Is it possible to have ODD Number of CPU's in any Windows OS (Physical/VM)

2) If YES (above), then why it is showing 4 CPUS in the task manager.

3) If NO, then why the Device Manager is showing 7 CPU's in VM.

Can any one help me to get the understand why there is a dfference.

Thanks

E Prasasd