Processor Speed displays incorrectly

Hello,

I've been having this problem randomly over the last couple of months and have not been able to figure it out my self so any help would be great!

Problem: In the systems information area my processor speed is displaying incorrectly. I'm not exactly sure what is causing it, but when this happens every video I play is choppy and every video game goes into SUPER slow motion... Please see the image below. The processor speed is showing 11.06GHZ when it should be displaying 3.8GHZ.

The ONLY way I cant temporarily fix this is to turn off the PC AND switch off the PSU. If I just shut down the PC without switching off the PSU it will not resolve the CPU speed issue.



Any help would be appreciated! Thanks.

This happened in an old m11x build I used that allowed OCing via the BIOS...
Except that it correctly displayed the OC speed next to the standard speed. Have you ever tried overclocking your CPU or changing your BIOS?

Fun fact:
That 11.06 speed is exactly 3.5 times the normal speed

Chaorace - The BIOS does allow overclocking (EVGA 750i FTW) and I do have it overclocked to 3.8ghz

Stalker - Here are the results from Speccy:

CPU
Intel Core 2 Duo E8500
Cores 2
Threads 2
Name Intel Core 2 Duo E8500
Code Name Wolfdale
Package Socket 775 LGA
Technology 45nm
Specification Intel(R) Core(TM)2 Duo CPU E8500 @ 3.16GHz
Family 6
Extended Family 6
Model 7
Extended Model 17
Stepping 6
Revision C0
Instructions MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1, Intel 64
Virtualization Supported, Disabled
Hyperthreading Not supported
Fan Speed 1467 RPM
Bus Speed 400.0 MHz
Rated Bus Speed 1599.9 MHz
Stock Core Speed 3166 MHz
Stock Bus Speed 333 MHz
Average Temperature 37 °C
Caches
L1 Data Cache Size 2 x 32 KBytes
L1 Instructions Cache Size 2 x 32 KBytes
L2 Unified Cache Size 6144 KBytes
Core 0
Core Speed 3800.1 MHz
Multiplier x 9.5
Bus Speed 400.0 MHz
Rated Bus Speed 1599.9 MHz
Temperature 37 °C
Thread 1
APIC ID 0

try turning off overclocking, then turning it back on. The problem may just be a wonky setting in the BIOS.

EDIT:
For best results, boot up after turning OC off so windows registers the standard speed and the BIOS saves the new configuration, then turn OC back on so windows sees the new speed and the BIOS saves this configuration.