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5 Posts

04-16-2014

malaysia

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Re: Lenovo Z510 CPU stuck at 0.77GHz

2014-04-16, 0:35 AM

i am having the same problem..this notebook is powerful and affortable but with the powerful cpu stuck at 0.77GHz feels like it is a big waste of $$..the huge drop in performance is noticeble and i had downgraded from win8 to win7 hoping it would fix it but it did not..please do what ever possible to fix it 

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7 Posts

04-16-2014

Denmark

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Re: Lenovo Z510 CPU stuck at 0.77GHz

2014-04-16, 15:58 PM

Hello. 

I JUST registered so I could comment on this. 

I have read it all through, and I am having the same problem. It only happens when I am playing League of Legends though. Grid 2, Kingdoms of Amalur, no problem. But when I go into League of Legends, it runs fine at 145 FPS on Ultra, and then suddenly drops to 30 when it goes back to 0.77 GHz - it shifts like that forever, it is NOT stable at all. I cannot do anything to change this. Please roll out a BIOS update. I am contemplating sending this laptop back because of this. It was affordable, and fantastic in every way... Until I discovered this. PLease reply to what seems like a genuin important problem Lenovo. 

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34 Posts

02-19-2014

Nederland

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Re: Lenovo Z510 CPU stuck at 0.77GHz

2014-04-16, 16:19 PM

MrDamm,

 

the issue you're facing looks more like a throttling issue when using the GPU.

Are you running on battery when this happens?

 

The issue we face here is when booting the notebook on battery the CPU never speeds up unless you either reboot or plug/unplug the power cord.

 

Using both the GPU and CPU at full potential on battery I've never seen go well on any (gaming) notebook.

If the throttling happens when plugged in, the GPU or CPU throttles to reduce heat production or power draw.

This can be a thermal or power related issue.

 

I'm not using the GPU at all (disabled in the bios) so I cannot tell you if this a common issue.

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7 Posts

04-16-2014

Denmark

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Re: Lenovo Z510 CPU stuck at 0.77GHz

2014-04-16, 16:24 PM

Hello lejohn

Thanks for the quick response... Wow! 

It have rebooted multiple times, and it is always plugged into the charger when I am using it for gaming. 
The thing which gets under my skin, is that it is working completely fine, running from 2.35 - 3.35 GHz according to what it needs, but then suddenly it just drops randomly to 0.77 GHz. I mean, it does not stay there, but it keeps this process up until I close the game - then the laptop is completely stable again. I don't know what might solve this, but a BIOS update sounds like it. I've experienced throttling issues with AMD as well... Which, ironically, is why I bought this laptop, so I wouldn't have any more processor-throttling issues. 

Would it be worth a try to disable the GPU in BIOS so I only run with the integrated Intel HD4600? 
This option seems a bit redundant, since the GT755m obviously is faster than the HD4600. 

Again, thanks for the quick response!

Update: I tried to disable the Nvidia GPU so it "just" ran on the Intel HD4600, I achieved 56 FPS, but it went down to 10 when it reduced the core-speed to 0.77 GHz AGAIN. So it had no effect - the CPU is the problem, not the GPU. 

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34 Posts

02-19-2014

Nederland

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Re: Lenovo Z510 CPU stuck at 0.77GHz

2014-04-16, 16:56 PM

Try using hwinfo to see if either the GPU or CPU heats up: http://www.hwinfo.com/download.php

Tick sensors only when starting. 

 

I have the i5-4200m with GT740m, but I'm not using it for playing games.

If you do I would not recommend disabling the GPU as it's faster than the HD4600.

 

Based on what you describe it looks like the GPU and CPU draw too much power and if clocking the CPU down to 2.35 GHz does not help, the CPU get's kicked down to 800 MHz.

If you want to reproduce it, run prime95 together with the Valley benchmark and hwinfo and see what happens.

Do get me started on AMD FX CPU's ;)

 

I would recommend opening a new thread, because this one is releated to a different problem.

 

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21 Posts

03-21-2014

United States of America

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Re: Lenovo Z510 CPU stuck at 0.77GHz

2014-04-18, 7:07 AM

No Fix , No Help , Where is lenovo engineers???????????????????????

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7 Posts

12-21-2013

Hungary

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Re: Lenovo Z510 CPU stuck at 0.77GHz

2014-04-18, 7:44 AM

As I read, they are releasing new models, instead of fixing Z510 :(

 

Being forced to use this laptop as a desktop is outrageous.

This is going on for 5 months now which is a measurable portion of a laptop's lifetime.

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106 Posts

09-02-2013

India

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Re: Lenovo Z510 CPU stuck at 0.77GHz

2014-04-18, 8:42 AM

lets put up the entire issue in lenovo's fb page then... that will prevent buyers from purchasing defective model .. :mansad:

 

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34 Posts

02-19-2014

Nederland

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Re: Lenovo Z510 CPU stuck at 0.77GHz

2014-04-18, 9:03 AM

That might draw their attention.

 

This issue, together with the useless WLAN white list in the bios, makes this my first and last Lenovo notebook.

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50 Posts

01-30-2014

Hungary

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Re: Lenovo Z510 CPU stuck at 0.77GHz

2014-04-18, 10:49 AM

I agree. Not to mention the 10/100Mbps LAN NIC. In this category (and even below of it) every notebook have 10/100/1000Mbps controller.

 

I'm thinking about selling this machine and buy an other one instead. Do you have any recommendations in this price?

 

And of course I will not recommend this notebook to anyone.

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