*OFFICIAL* Alienware 17 R5 Owner's Lounge

Discussion in '2015+ Alienware 13 / 15 / 17' started by alexnvidia, Apr 11, 2018.

  1. Aristotelhs2060

    Aristotelhs2060 Notebook Virtuoso

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    I did not ask why he replaced the heatsink but I would know the answer. Something like testing if something is broken or not good contact or something. Usual things that Dell techs say. The heatsink was the same. I did not check the part numbers because he came with the new heatsink and left with the old one.

    Dasachmo yes those over 90 degrees temps are spikes. In fact, they last for secs or sub secs. Even though you can see such temps even without doing anything, the fans are not even spinning faster (probably because there is no time for the fans to respond).

    So my question comes back again. Spikes up to 99 degrees for 1 sec or less. What harm can they cause to the CPU? And if the heatsink/thermal paste is the problem why temps go down by 20 degrees in secs? This is a wholly confusing.
     
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  2. rinneh

    rinneh Notebook Virtuoso

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    For such a short time it is no problem at all. Prologned exposure to those temperatures are though.
     
  3. doofus99

    doofus99 Notebook Evangelist

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    There are two possibilities.

    Possibility 1
    The heatsink is fitted badly, it does not make good contact with the CPU surface, you are seeing spikes but also higher consistent temperatures. In addition during some of these spikes the CPU throttles down to 800MHz...

    Possibility 2
    The heatsink is fitted perfectly and you still see spikes. It means that the CPU sensors do not record average heat over seconds, but rather instantaneous spikes. The heat has no time to travel to the surface of the IC and get picked up by the heatsink. It is just a spike and imagine a perfect sinusoidal (which this isn't, but close enough, I have the charts to prove it) the peaks are sqrt(2) higher than the mean, and it is the mean we care about mostly. Are these peaks dangerous above the max junction temperature? The answer is does the CPU throttle down to 800MHz? If yes then we have a problem and it is Intel related. Nothing to do with Dell !

    https://communities.intel.com/thread/119878

    https://www.eteknix.com/intel-core-i7-7700-suffering-high-temperature-spikes/

     
  4. doofus99

    doofus99 Notebook Evangelist

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    Under stress with the CPU at > 90C, do you still have cool/cold air coming forcefully out of the left side vent?
     
  5. Aristotelhs2060

    Aristotelhs2060 Notebook Virtuoso

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    Doofus99. Thanks for your reply. The fact is the more opinions I get from people, the more confused I become. I am not sure how those new CPUs work and regarding all those opinions I got, I am not even sure if someone is such a specialist to know.

    When CPU temps go over 90 and they are not spikes but more constant temps (eg. during benchmarks), then the fan are spinning faster yes. And yes more heat comes out as expected.

    Regarding the CPU throttle, I am not sure if the low frequencies that we occasionally see (around 790Mhz) are a result of throttle or just the CPU going down because even without doing anything special, frequencies go from 790Mhz to 4.7GHz (no overclock).

    And regarding what dasachmo said earlier, those spikes are CPU related and not Alienware/Dell related. Looks like this is just the way new CPUs work.
     
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  6. oSChakal

    oSChakal Notebook Consultant

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    Like some people previously told you, if your CPU is at 4.7GHz with no overclock, it mean that you're only stressing a single core.

    You need to use something like AIDA64 or even XTU.

    You're confused about what exactly?
     
  7. Aristotelhs2060

    Aristotelhs2060 Notebook Virtuoso

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    Ok, I run the first benchmark after applying the kryonaut thermal grease. Something has changed and it looks like it is to the better. I run the prime95 test with the in-place large fft options selected (this is what the Dell tech who issued the service told me to run before and after the heatsink/thermal paste replacement) which was stressing my CPU to the maximum. In fact this benchmark stresses only the CPU. CPU was previously reaching 103 degrees. It was the only benchmark that managed to reach that high temps. Now it reached 95 degrees maximum!

    And fans went down so fast, in secs after stopping the benchmark. And now stays so quiet! Idle temps about 37 and lower degrees. I have fan performance mode on BIOS, no overclock and thermal performance on alienware command center. Windows on balanced power.

    https://imgur.com/a/L4wtx8I
     
    Last edited: May 16, 2018
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  8. Aristotelhs2060

    Aristotelhs2060 Notebook Virtuoso

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    osChakal, as you can see all the cores reached 4.7 GHz. And I run the benchmark with exactly the same settings before and after applying the thermal paste/new heatsink


    Which AIDA64 benchmark do you suggest to run? There are many of them
     
    Last edited: May 16, 2018
  9. Aristotelhs2060

    Aristotelhs2060 Notebook Virtuoso

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    Can someone tell me the following:

    1) which benchmark to run (if more than one options within the program which one to run?)
    2) settings in BIOS to select:
    - a)fan performance setting?
    - b)CPU performance setting?
    3) alienware command center settings:
    - a) overclock profile?
    - b) thermal plan?
    4) windows power plan?

    Thanks
     
  10. Papusan

    Papusan JOKEBOOKS = That sucks! Dont wast your $$ on FILTH

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    Already posted Aida64 in previous post. FYI. If you run P95 with 4.7GHz all 6 cores you would see thermal shutdown or full throttling within a minute.
    Said it before. Use High Performance power plan and none of the cores should drop below max turbo all 6 cores. Easiest way to see if you had throttling.
     
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