W8.1 vs. W7 CPU frequency...

Cr00zng

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I am not certain why there's a substantial difference for idling CPU frequency between W8.1 and W7. My PC runs both OS in dual-boot mode, controlled by EUFI "F12" key. Other than both OS having it's own SSD drive, the hardware is identical.

Both OS used HWMonitor, v1.27.0, initially just to see the CPU temperature that lead me to the CPU frequency differences.

The HWMonitor for Windows 7 shows this:

w7 idle.jpg

The same for Windows 8.1 shows this:

w8.1_idle.jpg

And no, there isn't anything pegging the CPU, W8.1 task manager shows low CPU utilization around at the time the HWMonitor image had been captured:

cpu utilization.jpg

The CPU speed/frequency is actually confirmed by the task manager. Is speedstep broken in Windows 8.1, or HWMonitor is not accurate?
 

My Computer

System One

  • OS
    Win 8.1
    Computer type
    PC/Desktop
    System Manufacturer/Model
    Dell Latitude
    CPU
    Intel i5-3350P (3.1 GHz)
    Motherboard
    Gigabyte
    Memory
    16 GBs
    Graphics Card(s)
    AMD Radeon HD7850
    Sound Card
    Built-in to MB
    Monitor(s) Displays
    2 x 24" Dell
    Screen Resolution
    3,840 x1,200
    Hard Drives
    128 GBs, OCZ Vertex, SATA III SSD
    256 GBs Intel SATA III SSD
    3 x Seagate 1 TBs HDD
    PSU
    Antec 750W
    Case
    Antec P185
    Internet Speed
    50 Gb/s
    Browser
    IE11, Firefox22.0
    Antivirus
    Vipre
    Other Info
    Works, most of the times unless Microsoft patches decide otherwise...
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