A while back, I had posted that I was no longer able to see the Minimum Processor State in Windows 8.1 After much fiddling around, it was suggested here that I format again. A long time has passed since then, yesterday, I did a clean install of Windows 8.1 Pro GA Usually, when I check the task manager / Performance tab, my CPU speed is @ 3.27 GHz. on average since I am on the high performance power plan Later, I enabled Hyper-V from the Program & Features then restarted, I checked the performance tab again, and the speed has dropped down to 2.4 GHz.... I thought...what the heck, let me re-check my Min/Max CPU speed in the power plan, I went there, and to my surprise it has disappeared!! not only has it disappeared, but it does something to the actual min/max CPU speed that dropped down my CPU speed by like 25% I then went ahead and disabled Hyper-V again from the Programs & Features and guess what? Upon checking the performance tab of the Task Manager, the CPU speed is back to its usual 3.27 GHz. and the Min/Max CPU Utilization in the Advanced power options is back! Strange how noone noticed this, and Microsoft hasn't fixed it with all its updates!