XPS

Last reply by 06-19-2020 Unsolved
Start a Discussion
2 Bronze
2 Bronze

xps 9570 pch overheating

So I was downloading a steam game, I'm using school network so I got a 45mb/s download speed, and after a minute, I got a blue screen...

Fired up HWinfo64, try again, it turns out my PCH is at 92 degrees C. My CPU is at 57 degrees C and GPU 47, the ssd, the MOSFET, they are all fine. But why is my PCH so hot when I'm downloading at high speed?

PCH is not connected to the heatsink and is a passively cooled, exposed die. There's no airflow inside the case, and I can't just put a thermal pad there and call it a day. It only increases the thermal mass but still no thermal dissipation and it will still be hot AF after a few more minutes.

By the way I'm using an Ethernet to usb-c adapter instead of my wifi card. That's why it's not my wifi card that is exploding.

Pleas help.

Replies (24)
3 Zinc

If it is actually the PCH heating up for some odd reason, you could try padding it to the backplate with a few layers of good thermal pads, or also to the nearby vent case. But this is odd. Have you tried connecting to the network with a different LAN adapter?

Close to the PCH there is also certain charging circuitry (the laptop can charge via USB-C PD) which was reported to heat up a few times, particularly after battery replacements. Is the laptop hot at the lower-left end of the keyboard on the outside?

1. I can't remember what the blue screen error code is, but the error message is like a very generic one like "your computer experienced some issues and needs to be shutdown"

2. I'm using it on the desk with ac adapter in, not blocking airflow from the vent below for sure.

3. Nothing about thermal was shown, but nothing was shown even when I experienced cpu overheat shutdown before this

PCH is not like CPU or GPU, it does not have a changing clock speed and can be throttled. It only handles certain lower level tasks like display, I/O, IME, usb (including usb-c) controls, so throttling PCH is a joke.

The reason why I get a 92 C later is that I was only downloading without doing anything, while the shutdown happens when I was watching a 4k youtube video at the same time. I was able to reproduce the shutdown, this time without a blue screen, but the system just stuck and never respond.

The overheating is most likely to be caused by heavy use of usb hub. (usb-c Ethernet download, which puts a heavy load on pch, while Steam try to store these data on ssd, which puts a heavy load on pch again)

 

Moderator
Moderator


@BadHusband wrote:

So I was downloading a steam game, I'm using school network so I got a 45mb/s download speed, and after a minute, I got a blue screen...

Fired up HWinfo64, try again, it turns out my PCH is at 92 degrees C. My CPU is at 57 degrees C and GPU 47, the ssd, the MOSFET, they are all fine. But why is my PCH so hot when I'm downloading at high speed?

PCH is not connected to the heatsink and is a passively cooled, exposed die. There's no airflow inside the case, and I can't just put a thermal pad there and call it a day. It only increases the thermal mass but still no thermal dissipation and it will still be hot AF after a few more minutes.

By the way I'm using an Ethernet to usb-c adapter instead of my wifi card. That's why it's not my wifi card that is exploding.

Pleas help.


Hi @BadHusband

Whilst the system will exhibit high temperatures during intense use, including those in the 90's, the system shouldn't be shutting down from overheating. The system has been designed with temperature failsafes to throttle back the processor once it reaches a certain temperature. Once the system has returned below the limit the throttling will end. This is done to prevent the system from overheating and shutting itself down.

To get a better understanding of what happened, can you help me out with a few more details please - 
a) What was the blue screen error that you received?
b) When you were using the system, was it on a desk or were you using it on your lap?
c) Did the system at any point give you any error messages about thermal shutdown, or shutting down from excessive heat etc?

Alan

DELL-AlanD
Social Media Support
#IWork4Dell
I'm based in the UK and I'm usually available Monday to Friday 9am-4pm GMT
Get Support on Twitter @DellCaresPro

2 Iron

Mine too. Under load, the (uncooled) PCH and the VRMs near the GPU are on fire;

 PCH -> 100°C

VRM (after attaching small heatsinks and thermal pads): 100°C (125° before)

Top Contributor
Latest Solutions