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How to lower temperatures at idle in i7-8565U?

M

Megapunk

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After a week of reading tons of guides about undervolting, I finally decided to undervolt my laptop(Dell Latitude 3400- i7 8565U, 8GB, 500GB SATA,Intel UHD 620, nvidia MX130, WIndows 10 64 bit). I was able to decrease my temperatures significantly especially during medium and light usage. Temperatures in heavy usage/ Gaming definetly decrease from 80-85C to 75-80C. My temperatures are at 55-60 C with medium usage(Chrome) and 49C at idle. Is there a way I can possibly decrease my temperatures during idle state? It feels warm even at 49C.

Also the gaming temperatures werent actually so much lower until I created a new "Game" profile and lowered my turbo ratio limits. This helped with lowering temperatues and also stable FPS. The default turbo ratio limits would have very high FPS for 5 seconds and drop terribly low. Now I have an average-ish 75C while gaming. Also is there a way I could lower my temperatures during gaming even lower. I know intel says 100C can be easily sustained by their processors but this just feels hot.

Here are my settings:
(Idle)

Screenshot 2020-08-26 213304.png
Screenshot (7).png

-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
(not idle)
Screenshot (3).png

Screenshot (2).png
Screenshot (4).png
 
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On some laptops, using the Windows High Performance power scheme can interfere with the package C states that your CPU uses. Set this back to Balanced and see if your deeper package C states start working. Also try the Power Saver option. These CPUs support package C8 but some manufacturers (Dell) have disabled the low power package C states on some of their computers. Whether this was done accidentally or deliberately, I am not sure.

https://imgur.com/5ABGy2t

The biggest problem with many laptops that use Intel's low power U series CPUs are heatsinks that are as cheap as cheap can be. Intel knows their CPUs can run reliably at up to 100°C so laptop manufacturers have decided to put as little as possible into their heatsinks. Here is an example from a Lenovo.

https://imgur.com/xGoJNHp

Look at that thing. It is barely thicker than a piece of tinfoil. It is no match for the kind of heat that these CPUs can generate. You can use the best thermal paste in the world but that is not going to solve the problem if the heatsink engineers have been told to go with the minimalist approach. Your idle temps are probably about as good as they are going to get.

If Intel and Dell say it is OK to run your CPU hot then I would go along with that. Lowering the turbo ratio limits has reduced your laptop's CPU performance by 40%. You paid for a fast CPU so do not be afraid to use it.

When undervolting the Intel GPU, you also need to undervolt the iGPU Unslice, usually equally.

Check for programs on your computer. If you have both the Intel Control Panel and the newer Intel Graphics Command Center installed on your computer, uninstall the old one. Running both of these can also interfere with the package C states.

Edit - If Nvidia Optimus is working correctly, when you are sitting at the desktop, your Nvidia GPU should be in an idle state. ThrottleStop should show GPU --°C which means ThrottleStop is not going to wake your GPU up because it is idle. If ThrottleStop is always reporting a temperature for your Nvidia GPU, that usually means that something is running on your computer that is constantly using the Nvidia GPU. This is not necessary and just adds heat to your computer. If you are playing a game it makes sense that the Nvidia GPU is active but it does not need to be active when sitting at the desktop.

c64ofzZ.png
 
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I changed my power settings to Balanced, that didnt really help. But as you said the GPU is always showing some temperatures even at idle but I cant figure out what is using the gpu? Any ideas?
 
1598541703819.png


Open the Nvidia Control Panel and try using the Display GPU Activity Icon in Notification Area.
This might show if a program running in the background is using your Nvidia GPU.
 
According to your first screenshot your CPU is eating 1.5W of power which should translate into quite modest temperatures.

Since you're not seeing anything like that it indicates you've got either other components which are heating your laptop up (e.g. a discrete GPU if you have one, or even a WiFi module) or your CPU heat dissipation system is broken: e.g. not enough thermal paste, the heat spreader is not properly attached or a ton of dust.
 
Hi,
First thing I would do is get rid of all third party monitoring software and all manufacture crapware.

Use one preferably hwinfo or lite weight coretemp for monitoring temps...
If temps are messed up at optimized defaults in bios then you just have to rma there is such a thing as defective laptop cooling.
Messing with this cooling system with different paste.... can void warranties.

Easy fix is get a cooling pad to set the laptop on top of if out of return window.
 
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