CPU Fan not working properly?

[cyburg3]

When i run test like Prime95 and IPDT, my CPU goes to almost 100C wich is TJ MAX within a few seconds and then drops off to 80-85C. It also runs at 100-110W while around 100C even though my TDP is 65W. What the heck is going on?

 

I have two videos recorded using OBS with the lowest CPU usage settings(To not affect the tests) to show what i mean. OBS never uses more than 1% of the CPU and is a lower priority than the testing software. On some tests the FPS of the recording drops from 24 so the temperature readings might seem laggy as they are polled every 100ms. 

 

The fan also doesnt sound like it is running that much.

 

Is the fan not running well enough so that the CPU has to throttle itself?

 

There are diagnostics tests in the BIOS that test everything from the CPU to the RAM and both Front and Rear fans. Everything checks out okay on that.

 

Everything is up to date, including windows, drivers and BIOS.

 

The bios has an option for Intel speed step and speed shift and they are both on by default, does this have anything to do with it?

 

My CPU is not overclocked and everything is stock as is the way it was when first bought(Except for Clean OS install.)

 

Specs:

 

Dell Inspiron 5680(Stock)

 

Intel Core I7-8700

 

Windows 10 64-bit

 

Bios version 1.3.2(Latest)

2018-08-28 15-15-35.flv

[cyburg3]

Second video.

2018-08-28 15-35-50.flv

[WoodenMarker]

Intel Speedstep raises and lowers clocks to save power. Speed Shift is similar relies less on the OS and is faster. https://www.anandtech.com/show/9751/examining-intel-skylake-speed-shift-more-responsive-processors

These shouldn't make a difference. 

What header is the cpu fan plugged into and what rpm is is running at? Can you edit the fan curve?

What's the core voltage set to?

 

Moved to Air Cooling. 

[cyburg3]

9 minutes ago, WoodenMarker said:

Intel Speedstep raises and lowers clocks to save power. Speed Shift is similar relies less on the OS and is faster. https://www.anandtech.com/show/9751/examining-intel-skylake-speed-shift-more-responsive-processors

These shouldn't make a difference. 

What header is the cpu fan plugged into and what rpm is is running at? Can you edit the fan curve?

What's the core voltage set to?

 

Moved to Air Cooling. 

In the bios there is no option for core voltage, it is all automatic. You can see what it is in the video though. The RPM does not show on any program so i don't think the bios reports on that. I haven't open'd up the computer yet and everything is stock.

[WoodenMarker]

2 minutes ago, cyburg3 said:

In the bios there is no option for core voltage, it is all automatic. You can see what it is in the video though. The RPM does not show on any program so i don't think the bios reports on that. I haven't open'd up the computer yet and everything is stock.

Do you see the fan on the cooler spinning? Is it dusty?

[cyburg3]

1 minute ago, WoodenMarker said:

Do you see the fan on the cooler spinning? Is it dusty?

I can hear it but its not that loud, the computer is only a few months old and it shouldn't be dusty. I think its a problem with the way the automatic fan regulation is programmed. I cant see it because there is no glass window.

[WoodenMarker]

Just now, cyburg3 said:

I can hear it but its not that loud, the computer is only a few months old and it shouldn't be dusty. I think its a problem with the way the automatic fan regulation is programmed. I cant see it because there is no glass window.

Open up the side panel to check. The fan you're hearing might not be the cpu fan. 

You should also check what fan header it's connected to.

[cyburg3]

I can actually see the computer fan through the back, but the side cover screws wont come off, they are some weird type called 6-32 UNC x 6.3

 

EDIT: Sorry, they are phillips head, but i still cant open them.

 

Did you watch at least part of the videos?

[WoodenMarker]

4 hours ago, cyburg3 said:

I can actually see the computer fan through the back, but the side cover screws wont come off, they are some weird type called 6-32 UNC x 6.3

EDIT: Sorry, they are phillips head, but i still cant open them.

Did you watch at least part of the videos?

I saw the videos but I didn't see anything show fan speeds or what fan header the cpu fan is connected to. 

Why can't you open it? No phillips head screwdriver?

[EsaT]

13 hours ago, cyburg3 said:

When i run test like Prime95 and IPDT, my CPU goes to almost 100C wich is TJ MAX within a few seconds and then drops off to 80-85C. It also runs at 100-110W while around 100C even though my TDP is 65W. What the heck is going on?

1:

Intel's marketing uses "artistic freedom" and actual full load power consumption can be lot higher than advertised TDP....

Which is specified only for base clocks, if you look at small print.

 

2:

100C is max temperature at which point CPU itself starts limiting its clocks to prevent damage.

Also motherboard's CPU VRM likely starts overheating making motherboard limit clocks, causing CPU temperature stabilizing at lower level.