My Lenovo Y520-IKBN's CPU is throttling, its WEIRD.

ArhamAsam

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Jul 4, 2017
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My laptop specs are:
i5 7300 HQ
GTX 1050ti
256GB SSD
Windows 10

My problem is weird. When my laptop is plugged in and over 40% battery then it works fine.
However, when the battery drops below 40% (Whilst plugged in), then the CPU throttles. In Intel XTU it states that it is thermal throttling, even though the temps are never over 70C when this phenomenon occurs. I also noticed that the Package TDP power drops from around 20-25 W to 7-9W. This was confusing as intel xtu thinks it is thermal throttling but it is a voltage throttle. This causes HORRIBLE fps in games and make the computer very slow. I suspect that somehow the computer goes to power saver mode when at 40%, even though I selected High performance in power options. Also note that the issue is only resolved when i restart it whilst above 40% charging. In other words, when the throttle happens it cannot be fixed unless by restarting laptop, charging to over 40% doesnt fix it.

I have updates bios and recently re installed windows.
NOTE: I am using a 4.5Amp replacement charger( even though y520 needs a 6.7 amp one HOWEVER, it was working fine until recently something happened)
 
Solution
Okay. Then I would suggest waiting for the new charger or replacing the battery. I would think that the new charger (as long as it meets the needs of the computer) would fix the issue.

ameyer75

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Have you installed any windows updates around the time you started noticing the issue? Have you opened the computer and cleaned it out? It's *possible* that one of the fans died or the original thermal paste is in need of replacement? It definitely sounds to me like your computer is voltage throttling though. Are you using the original battery?
 

ArhamAsam

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Jul 4, 2017
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Oddly enough, the issue was partially resolved after a windows update. Had the computer cleaned out in April and it was working fine, I think the problems started when i bought the new charger. I also noticed that while gaming, due to lack of voltage it slowly discharges. And throttles at 40%. My only request now is I need a way to prevent the throttling at 40% even if the laptop eventually runs out of battery as I will buy a replacement charger in a few weeks
 

ameyer75

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Okay. Then I would suggest waiting for the new charger or replacing the battery. I would think that the new charger (as long as it meets the needs of the computer) would fix the issue.
 
Solution