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What's DOS?
Posts: 2
Registered: ‎02-12-2017
Location: TR
Views: 1,075
Message 1 of 2

Yoga 500 low cpu clock speed / multiplier



Couple of days ago i have noticed drops in the performance of my laptop. I couldnt stream  a movie or surf web on more than one web pages without lag even though i have 8gb ram and ssd installed on my laptop. Today i had a chance to review the issue. I have checked all lately installed programs and updates. Only thing that stand out was external graphic driver update on the day problem started. I tried rolling back that update and when it didn't work disabling the external graphic driver. That didn't help neither. I have also updated all drivers including bios and checked bios settings. Only thing wrong with the pc was that cpu speed stuck at 498 mhz and clock speed at 5x. (Checked with cpu-z and prime95 torture set no changes). I was able to resolve the issue by using throttlestop application and disabling bd prochot.  I know this is not a permanent a solution. Any ideas regarding this issue?




Lenovo Yoga 500 - 14IBD

Win 10 - 64 bit

extra 4gb ram  and 128 gb ssd installed over standart hardware.




Support Specialist
Posts: 180
Registered: ‎11-28-2016
Location: GB
Views: 982
Message 2 of 2

Re: Yoga 500 low cpu clock speed / multiplier

Hello espio,


Thank you for using the Lenovo forums.


This sounds like that this could likely be caused by perhaps some sort of software, possibly even a virus.

I would recommend that you run your Antivirus scans and see if they are able to detect anything.


Other than that, a windows reset, or factory reset might help as well.

Steps for Windows reset:

Note: resetting your machine will not delete any of your files or documents on your machine. However any programs will be uninstalled.

1. Click the "Start" button on the bottom left and select "Settings". Next you will need click on update and security.

2. Click on the "Recovery"  "Get started" located under "Reset this PC".

3. Finally you should then be given a choice of 3 options and you will need to select "Keep my files". The machine will then restart multiple times the length of time to complete can vary depending on the machine.


Steps for a factory reset:

This will rule out any software related issues. 
Note: Please back up all your data as running this reset will delete any data on your machine which Lenovo cannot be responsible for.

1.  Turn the machine off and press the recovery button which is located usually next to the power button. If you have a desktop machine you will need to power the machine back on and keep tapping the F2 key.

2.  Use the arrow keys and press enter on system recovery. ( Desktop users can skip this)

3.  Select “restore from the initial backup” and then “Next”.

4.  Click “start” and accept the warning messages.

Length of time can vary depending on the speed of the machine.


 If these steps do not work or you would like more info on this issue you can call your local Lenovo support line. Below is the link to the phone list where you can find these numbers


Hope this help you and let us know how you get on

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