XPS 15 9550 temperature observations (undervolt + repaste)

Discussion in 'Dell XPS and Studio XPS' started by custom90gt, Dec 28, 2015.

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  1. pressing

    pressing Notebook Deity

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  2. custom90gt

    custom90gt Doc Mod Super Moderator

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    Wow he's had great results. The conductonaut looks like good stuff, I may order some...
     
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  3. pressing

    pressing Notebook Deity

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    I was thinking the same but want to better understand the performance of liquid metal pastes after several months. Misapplication is also dangerous!
     
  4. custom90gt

    custom90gt Doc Mod Super Moderator

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    I have no worries about the application process. I typically repaste my cpus/gpus every few months so the long term isn't typically an issue for me. I would be curious how it would hold up after a year or two though.
     
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  5. GoNz0

    GoNz0 Notebook Prophet

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    Let me know how you get on. Risky with a delidded cpu as any spillages could fry the board. Only to be done with a board under warranty ;)
     
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  6. pressing

    pressing Notebook Deity

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    Last spring when I was shopping for the latest and greatest thermal paste, I read a few posts about liquid metal performance declines after 3-6 months. But there just wasn't enough reliable data to draw any conclusions. If you search the threads now, I would guess there is a lot more data available...

    The liquid metal thermal performance looks staggeringly good so that might become more popular as the "hot" new nvidia GPUs get traction...
     
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  7. arshcaria

    arshcaria Notebook Enthusiast

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    Just a quick question. When you are talking about "VRAM" and "VRM", are they the same thing?
     
  8. pressing

    pressing Notebook Deity

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    Different. VRAM = video RAM
     
  9. GoNz0

    GoNz0 Notebook Prophet

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    You could have asked google you know ;)
     
  10. arshcaria

    arshcaria Notebook Enthusiast

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    XPS 9550 i7 960M 512GB FHD

    I did repaste 8 months ago but these days the thermal performance became worse (I was using some really crappy thermal paste). So I just repasted with MX-4 today. I also ordered some thermal pads and are waiting for them to arrive.

    The results (tested with prime95 small FFTs) are nice:

    Stock - about 92*C
    Undervolt by 170mv - 80*C
    Stock voltage with repaste - 82*C
    Repaste and undervolt by 170mv - 73*C

    The only thing annoying me now is that the fan noise is quite noticeable even when the temperature is relatively low (40*C). Changing "Thermal management" in Dell power manager doesn't really help.

    I am not sure if that is because of VRM or PCH temperature.

    I also noticed that on the motherboard there is a bare chip with a glossy surface. It is not attached to any heatsink. What is that?

    EDIT

    More about the fan noise.

    Changing "Thermal setting" to "Quite" only can temporarily lower the fan speed (like for 10 seconds or so). After that the fans speed up as usual.
     
    Last edited: Dec 13, 2016
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