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Solved Acer aspire 3 a315-55g-77k7 Suttering problems...GPU/CPU heatsink might be the cause

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So I have a new problem with my pc, I encounter it all the time in games and also in normal use,when under full load the laptop stutters.
I mean in games(csgo) it goes with 110-120 fps for 2-3 seconds than it lags for 1-2 seconds(20-30fps) and goes up again to 110-120 and its doing this continuously(it used to run in 140-150 all the time)
Its doing this in chrome and other apps too...

Laptop: Acer Aspire 3
(A315-55G-77k7)
Cpu: Intel i7-10510U
Gpu: Nvidia MX230

I dont know what the problem is, the only thing I might know is the cause but I'm not sure if this is it. I opened the latop up, to see the internals(to see if an ssd upgrade is possible), and I saw that there was a lot of thermal paste in a lot of places where it shouldn't be(on the green coloured motherboard pieces), at least thats what i thought , but im sure the motherboard requires no thermal paste, and not in so small ammounts, so i cleaned it, gently with a cotton swab, and then put back the copper pipes on the cpu and gpu( one piece ) and I dont know if i tightened the screws enough or too much.
I tried losening them and tightening them, it helped a bit but not back to normal, and now after more antempts of adjustment I think its the worst (60-80fps in menu) (35-45fps in game ) and it still does that 1-2 second lag

Hdd under 100%load all the time..

(Also when it was more okish(frames were 100-110), when i pressed not hard(gently) the part on the pc where the cpu and gpu is(metal part in front of laptop, above and on keyboard) it dropped suddenly to 20-30fps again)
I found this very strange.

I tried to do everything as gently and patiently as possible but now I'm relly scared that I messed everything up... :'(

It is still in warranty but I think I already voided that with my stupid acts.(if not please tell me so i can send it in for repair)
 
Thank you very much!, Yes that was the problem but now i think i need to apply new thermal paste because its still thermal throttleing even when reaching only 80°C, not even the Tjunction(100°C)
 
Hi
Once pulled apart you need to put new thermal paste.
I use Arctic Silver Click On Me. Everyone has a thermal paste they prefer.
Clean CPU ( DO NOT REMOVE) and bottom of heat sink using Methylated spirits or Isopropyl Alcohol (rubbing alcohol)
Apply Thermal Paste Click On Me to CPU Everyone has a different method.
The aim is a nice covering Too little = Bad, Too much = Bad (Think Goldilocks and the three bears). Pic attached

and I dont know if i tightened the screws enough or too much.
When you tighten the screws tighten till they stop using normal pressure NOT Hulk Pressure. If you leave them loose you will not make a good contact.
 

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Wow honestly this is the best answer to my problem on multiple forums. Thank you very much =))
Your welcome - Lets hope it solves your problem.
Please let us know either way - if it does not work then we will look at other things.
If it does work then others can learn.
As an after thought when you have the laptop open check for dust build up in the fan
 
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