Question My core VID&speed are very unstable

[MonkeyCC]

Hello, I use CPU-z to monitor my hardware status and it turns out that my CPU core vid dramatically changes to any number between 1.281 and 0.667 and at the same time my core speed would alter to any number between 3889 and 789. Do you know what is wrong with my CPU? I own Alienware 17 R5, i7-8750

 

[Moot_Senpai]

CPU throttling, it's normal. Read Here

 

[Phaaze88]

The cpu is thermal throttling, i.e., overheating and clocking down to protect itself, but this reduces performance.
Take care not to block the vents underneath, and on the sides of the laptop, as this will easily choke it and cause throttling. You may want to consider getting one of those laptop cooling pads.
Also it wouldn't hurt to get a can of compressed air and use it on those vents to blow out any dust that will have collected.

What are your temps like while using it?

 

[Moot_Senpai]

Could be, or it may just be throttling to conserve battery

 

[MonkeyCC]

The cpu is thermal throttling, i.e., overheating and clocking down to protect itself, but this reduces performance.
Take care not to block the vents underneath, and on the sides of the laptop, as this will easily choke it and cause throttling. You may want to consider getting one of those laptop cooling pads.
Also it wouldn't hurt to get a can of compressed air and use it on those vents to blow out any dust that will have collected.

What are your temps like while using it?

Hello, I use Throttlestop to monitor the temp, and while I am gaming, the temp can go as high as 92C

 

[MonkeyCC]

Could be, or it may just be throttling to conserve battery

I am concerning that I may have the overheating issue because when I play a game for a while, the performance will suddendly drop and the FPS rate would alter from 300-150

 

[TJ Hooker]

turns out that my CPU core vid dramatically changes to any number between 1.281 and 0.667 and at the same time my core speed would alter to any number between 3889 and 789

What are you running on your laptop while you're seeing these values? On battery or AC power?
Also, you generally want to look at Vcore rather than VID.

 

[MonkeyCC]

What are you running on your laptop while you're seeing these values? On battery or AC power?
Also, you generally want to look at Vcore rather than VID.

On AC power. And I don't see the Vcore lable on Cpu-Z, there is only VID

 

[TJ Hooker]

What sort of load are you running?

Try using hwinfo64 (select Sensors Only upon launch).

 

[MonkeyCC]

What sort of load are you running?

Try using hwinfo64 (select Sensors Only upon launch).

I've downloaded and installed hwinfo64 and selected sensors only, what should I look for?

 

[TJ Hooker]

I think it's labelled Vcore or core voltage. But I don't know if that's really going to tell you anything on its own, I was just pointing out that it's more useful to look compared to looking at VID as you mentioned in your first post.

 

[MonkeyCC]

I think it's labelled Vcore or core voltage. But I don't know if that's really going to tell you anything on its own, I was just pointing out that it's more useful to look compared to looking at VID as you mentioned in your first post.

Okay, but the only thing that is related to core voltage is the GPU core voltage, somehow I don’t see the CPU core voltage or VCore

 

[TJ Hooker]

I'd be highly surprised if it wasn't there, but like I said it's not critical.

What exactly are you doing on your laptop when the CPU is fluctuating between 3889 and 789? What is the temperature you see just before the clock speed dips?

 

[MonkeyCC]

I'd be highly surprised if it wasn't there, but like I said it's not critical.

What exactly are you doing on your laptop when the CPU is fluctuating between 3889 and 789? What is the temperature you see just before the clock speed dips?

Basically in the idle mode. And I can’t answer your second question because I don’t know what is the clock speed dips

 

[TJ Hooker]

Having the clock speed fluctuate between 800 and 4000 MHz while idling or doing basic desktop stuff is normal. The CPU speed will ramp up whenever it needs to do something (you launch a program, load a webpage, or some process does something in the background) and then return to idle speed once it finishes.