windows 8.1 - Why does Hyper-V affect in task manager?

If you look at image you can see that in Task Manager CPU tab.

1. 
   

   Why when Hyper-V enable Speed and Max Speed same and it does not change the way it change when Hyper-V disable ?

   
   


2. 
   

   Why this apply to only Core I5 machine and Not Core I7 ? I have Core I7 but it display same if hyper-V enable or not ?

   
   

Below is the image of Core I7 with Hyper-V enable.

Please provide detail on this.