Why does the video card on a Linux laptop get very hot?

Question

linux

A laptop with an Nvidia 650M video card, only an external 27 monitor works. For the
last week and a half, the video card has become very warm, and the FPS drops significantly joxi.ru/a2XOyxNFyZeKpm Previously, it did not fall below 5000 and the temperature was lower. I
updated the drivers, but 361 does not fit into any, only 358. I
thought maybe thermal paste, smeared cpt-8, but it didn’t help, I decided to fork out for arctic cooling mx-2 (4 I didn’t find) saved by 3-4 degrees

Answer 1

In general, apparently the problem was in the kernel. After the new linux-generic-header update arrived, the temperature returned to normal.
There is also a problem with the external monitor. Turned it off, the temperature dropped 10-20 degrees

Answer 2

There was such a thing on the CPU, when the radiator with the cooler was poorly pressed to the processor, maybe you also had
5 minutes and the computer went into defense

Answer 3

It is worth to announce the model.

Answer 4

Under Windows with native firewood everything is fine, or does it also slow down?
From the answer to this question, solve the problem (either in Linux there is a problem with firewood, or in hardware, the first is much more likely).