CPU Core Speed stuck at 0.80GHz (i5-6600k)

[Will_44]

Hi, I've just built my first computer and no matter what I try the core speed of my cpu won't exceed 800Mhz. I've updated the bios to check that's not the issue. Power options in the windows settings are high performance so that's not the issue either. The core speed is the same when the PC is idle, and when I send it through stress test or run games.
According to cpu-z, the bus speed is 100mhz and the multiplier is 8-45, but it seems to be stuck on the 8 multiplier regardless of what the pc is doing.

The spec of my pc is:
i5-6600k
16gb (2x8) ddr4 3000mhz RAM
msi gaming m5 z170 motherboard
corsair 750m psu
gtx 1070 msi gaming x 8g

 

[hgec207257841]

update bios wokt for me

 

[pieter.sadie]

I had a similar problem at a client with a Windows 10, Dell Celeron Laptop.

I think the Windows Power Saving Settings are to blame for this - usually only affect laptops, but perhaps could affect desktops too?

The CPU ran at 30% maximum utilization, at 0.48Ghz PERMANENTLY, every day.

I noticed at the right bottom of the screen that although the laptop was plugged into power, the battery icon said "not charging" and battery level was 1%.

To resolve it, I did the following (perhaps this could work for you too):

Double-click the battery icon (not right-click) at the right-bottom of the screen (in the tray)
Click "Battery Settings"
Untick the option for: "Turn battery saver on automatically if my battery falls below..."
Disable the setting: "Battery saver status until next recharge"
Unplug the charging cable and re-plug it into the charging port of the laptop.
The battery icon at the right bottom of the screen should now change to "Charging".

After this the CPU started running at 100%, 2.48Ghz and the machine worked well again.

For good measure, click on the battery icon again and set the power mode to "Best Performance"

Note: I noticed that all the battery settings for "Pressing the Power Button", "Pressing the Sleep button" and "Closing the lid" were set to SLEEP. So I guess that every day when the client went home, he closed the lid and put it in his laptop bag. This totally drained the battery, and because the setting was enabled to use Battery Saving when power dips below 20%, every morning the laptop would be SUPER slow. The problem was that it would never start to charge either.

Whether the Battery Saver setting disabled the battery from charging I can't say for sure.

To avoid the problem for this client, I changed most settings to "Shutdown" and some to "Hibernate"