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50 Posts

01-30-2014

Hungary

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Re: Lenovo Z510 CPU stuck at 0.77GHz

2014-04-09, 19:03 PM

I just wanted to ask it too.

We already have Windows 8.1 Update 1, new Intel and Nvidia drivers.

The notebook is still faulty.

 

Please give us some information about your progress Lenovo Team.

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34 Posts

02-19-2014

Nederland

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Re: Lenovo Z510 CPU stuck at 0.77GHz

2014-04-10, 9:59 AM

Maybe the RMA rate of this model needs to increase before the problem is noticed.

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106 Posts

09-02-2013

India

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Re: Lenovo Z510 CPU stuck at 0.77GHz

2014-04-10, 14:29 PM
Or maybe we should share our great experiences on lenovo's facebook page...
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236 Posts

05-09-2010

Cochrane

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Re: Lenovo Z510 CPU stuck at 0.77GHz

2014-04-11, 16:01 PM

The bios guys need to rethink what they are doing.  A long time ago, a slow CPU was a method to reduce power consumption when on battery power but that method is obsolete.  The individual cores of an Intel 4th Generation mobile CPU automatically use the low power C7 C state.  There is no longer a need to hold the CPU to 0.77 GHz.  A slow CPU is not efficient.  A slow CPU means it will have to spend more time awake, slowly working processing the WIndows background tasks.  It is far better to have the CPU get its work done as fast as possible.  This allows it to spend a higher percentage of idle time in C7 where CPU power consumption is virtually zero.  Maximizing C State residency time saves power.  A slow CPU does not.

 

Power Optimization – a Reality Check

http://www.cs.berkeley.edu/~krioukov/realityCheck.pdf

 

Here is how a Y510P looks on battery power.  You can have a fast CPU and still get very good battery life. 

 

 

It would be nice if Lenovo released an updated bios to fix this problem but that might not ever happen.  Many consumers are not wise enough to realize that their laptop is not running at its full Intel rated speed.  Even if they do realize that something is wrong, they might accept that 0.77 GHz is necessary.  

 

While waiting for an official solution from Lenovo, if you want to run your Z510 at its full rated speed when on battery power then check out the program I posted on the previous page.  It lets you run your CPU however you like.  

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50 Posts

01-30-2014

Hungary

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Re: Lenovo Z510 CPU stuck at 0.77GHz

2014-04-11, 17:53 PM

Hi!

 

Thanks for that post!

I hope not just the moderator but the Lenovo engineering team members will read it too.

 

The CPU and the GPU speed should not be reduced!

The Lenovo Z510 on battery is slower than a 10 years old machine with a Pentium 4 CPU!

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50 Posts

01-30-2014

Hungary

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Re: Lenovo Z510 CPU stuck at 0.77GHz

2014-04-12, 10:12 AM

Look at that:

 

http://rog.asus.com/forum/showthread.php?35062-Processor-stuck-at-.77Ghz-when-unplugged-solved-w-new-bios/page3&s=73166e309e8bcd384337517f1fab3311

 

#28:

"I can confirm that the CPU in my G750 works normally on AC power, but drops down to .77Ghz on battery power and stays stuck there regardless of the ASUS or Windows 8 power management settings."

 

I would be very happy if an engineer explain us that what is wrong with the Haswell architecture!

A notebook with a 3rd generation Intel CPU is operating on full speed while the Ivy Bridge version stuck on 700-800MHz on battery! Why?

It means that we have to sell our notebooks and buy an older model in order to use it?

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34 Posts

02-19-2014

Nederland

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Re: Lenovo Z510 CPU stuck at 0.77GHz

2014-04-12, 17:17 PM

If this is true, the CPU would never speed up on battery.

The fact that rebooting the notebook or plugging & unplugging the power supply makes the CPU operate as it should, clearly shows this is an issue and not a limitation of the Z510.

 

There might be other models from different brands affectedby this issue.

I personally haven't seen it happen on any of other notebooks.

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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

2014-04-14, 10:39 AM

i go to Bios to looking for anything to change

 

I noticed when i go to bios and see every menu and exit (every time)
the windows work fine (CPU) like when i use AC power ( CPU chang from 0.79 ) can anyone try this ??? (go to bios see all manu and exit)

 

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106 Posts

09-02-2013

India

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Re: Lenovo Z510 CPU stuck at 0.77GHz

2014-04-14, 13:35 PM
dear someone8,
now that's same as a restart ... only thing is that you do it without booting OS...

whatever it maybe its still a defect ... they can't expect us to go into bios settings each time we startup in battery mode
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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

2014-04-15, 5:39 AM

dear lknaidu,

 

I just wanted to share what I found, but we can not accept this, and I hope the team of engineers Lenovo fix this problem.

 

I hope that this problem is solved by anyone:smileysad:

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