CPU Core Usage, Windows Server 2012 R2

I have a Server with 8 Cores, Windows server 2012 R2 installed. The server is used as web server (IIS).
I can see from resource monitor that only 4 core is used the others has less activity on it show CPU 4 Parked.

Is that mean that these core is not working? if so how can can get benefit of them?
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Cliff GaliherCommented:
Unless you are seeing your CPUs pegged, this is probably not a problem. Hyper-V will park CPUs for power management by default if there isn't enough activity to justify turning them on. This actually can improve performance as well since the resource manager doesn't have to look for breaks in activity to rebalance workloads on different cores. This is particularly true on virtualized workloads but is generally true across the board.

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