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74 Posts

04-04-2012

United States of America

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Re: New P51 - CPU temps hit 100C

2017-11-06, 17:35 PM

I wondered the same, but I'm still getting throttling even after the repaste and I torqued them down as tightly as I felt comfortable doing.  Once it hit collar on the screw it just wasn't going any tighter.

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227 Posts

07-28-2016

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Re: New P51 - CPU temps hit 100C

2017-11-06, 18:01 PM

Hmm, is there any adjustment on the cpu/gpu "socket", like the old zif sockets with the lever?

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74 Posts

04-04-2012

United States of America

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Re: New P51 - CPU temps hit 100C

2017-11-06, 18:03 PM

There is no socket here.  It's a BGA CPU.  It looks removable in the pictures because Lenovo put a plastic coating around the die to prevent the massive amount of TIM they put on the heatsink from getting on the CPU itself.  

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227 Posts

07-28-2016

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Re: New P51 - CPU temps hit 100C

2017-11-06, 18:13 PM

Ok, thanks for the response. Just trying to think of issues that may have been merely overlooked rather than an actual design flaw. I can understand that mistakes happen, but it is difficult to imagine a company with this much experience actually has a design issue rather than a simple qc problem.

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74 Posts

04-04-2012

United States of America

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Re: New P51 - CPU temps hit 100C

2017-11-06, 18:15 PM
I'm in the same boat. I lost faith when I looked at the thermal pads...any 1st year engineering student would have immediately noticed the fact that they don't make contact during the QA phase of design. The weird thing is the rest of the system as a whole is both designed and implemented quite well. Built like a tank with some really good design choices (like the internal magnesium frame). Just one small oversight that ruins the rest of it.
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227 Posts

07-28-2016

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Re: New P51 - CPU temps hit 100C

2017-11-06, 18:20 PM

Well lucky for everyone the these machines are still covered under factory warranties. Hopefully Lenovo steps up with a solution or at the very least extends the warranties by several years to address any long term issues that may result from heat or thermal related events.

 

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1 Posts

11-09-2017

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Re: New P51 - CPU temps hit 100C

2017-11-09, 15:43 PM

I should receive my new p51 in couple of days.

How can I check if I have this issue?

which tests/program should I run in order to figure it out?

what are the expected results? Should I return the product if the the temps are high?

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49 Posts

12-24-2012

Ireland

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Re: New P51 - CPU temps hit 100C

2017-11-09, 18:12 PM

@uzielr: You can run the CPU test in the Intel Extrem Tuning Utility (XTU) for a couple of minutes. It uses the CPU to the max. It should not report temperatures over 80°C I guess (I heard that some P51 only go as far as 76°C), and it should not report thermal throttling (that as far as I know begins at 95°C).

 

Another option is to use Sysinternals CpuStres tool to generate a number of threads with given load (you can start CpuStres multiple times to get the CPU run high). Check the CPU utilization with the Task Manager (or with XTU), and check the temps with HWiNFO64 (or XTU).

 

Please note that the temperature problem at least in my case occured after a few days of use. So at first the temps might be okay, but then after a couple of days they get up.

 

Just as a side-note: In battery mode the CPU is throttled down to under 0.8 GHz by default (see here), so testing with AC not attached does not get the CPU temps high. You can remove the massive throttling in the BIOS (Power section), but you need a newer BIOS for it to work.

 

Good luck

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25 Posts

11-06-2017

Romania

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Re: New P51 - CPU temps hit 100C

2017-11-09, 18:25 PM

@uzielr: When you receive your unit, could you let us know about your findings? Ideally out of the box, but also after a few days/weeks?

 

If the results are positive, maybe this means that they have fixed this issue?

 

We would expect this from a respectable branch such as Lenovo ThinkPad, ideally accompanied w/ some kind of news/announcements. But I don't know why my instinct tells me that this won't be the case...

 

I have seen that sometimes Lenovo officials participate to threads. This would be a good moment for that.

 

Meanwhile good luck w/ your unit!

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39 Posts

06-28-2017

Canada

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Re: New P51 - CPU temps hit 100C

2017-11-10, 3:37 AM

my P71 was perfect when it arrived, and now 2 weeks later it starts to overheat, throttle, so I guess the problem is with subpar TIM or heatsink assembly. And it defientely degrades very rapidly.

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