XPS 15 9550 temperature observations (undervolt + repaste)

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

  1. Paul67

    Paul67 Notebook Enthusiast

    Reputations:
    0
    Messages:
    18
    Likes Received:
    1
    Trophy Points:
    6
    After some "tweaking" my core package temps on Prime95 are at 59c - massively down from at least 77c (even on a short test))

    I'm very impressed! No more fans on idle really does it for me. Cheers guys! I'm only a novice so achieving this is a very good thing! ;)
     
  2. tachlio

    tachlio Notebook Enthusiast

    Reputations:
    0
    Messages:
    24
    Likes Received:
    4
    Trophy Points:
    6
    Just done undervolt + first repaste actity

    Default
    Undervolt : Non
    CPU : 91c
    Ambient : 68c
    Fan : 4890 RPM

    Undervolt (1)
    Undervolt : CPU-0.14 iGPU-0.10
    CPU : 83c
    Ambient : 65c
    Fan : 4070 RPM

    Undervolt (2)
    Undervolt : CPU-0.15
    CPU : 80c
    Ambient : 65c
    Fan : -RPM
    Finally decide 0.14 for some safety factor

    Repaste + Repaste
    Undervolt : CPU-0.14 iGPU-0.10
    Paste : Cooler Master Mastergel Maker
    CPU : 74c
    Ambient : 62c
    Fan : 3220RPM

    Repaste + Repaste
    Undervolt : CPU-0.14 iGPU-0.10
    Paste : Artic MX4
    CPU : -c
    Ambient : -c
    Fan : -RPM
    TBC

    Detail Step
    1. Preparation
    2. Internal
    3. SSD Thermal Pad

    4. Paste

    5. Before & After Pasting

    6. VRAM & Paste
    Confirm Dell using 1.0mm thickness for all
    [​IMG]6.0 VRAM Pad Thickness
    Realign
    [​IMG]6.1 VRAM Pad Align
    [​IMG]6.2 VRAM Pad Add

    7. VRM
    Confirm 4.0mm distance to touch chassis
    [​IMG]7.0 VRM Distance
    Preliminary try, like to observe few day on temps
    [​IMG]7.1 VRM Pad Add
     
    Jean-Cyril and pressing like this.
  3. pressing

    pressing Notebook Deity

    Reputations:
    145
    Messages:
    1,083
    Likes Received:
    420
    Trophy Points:
    101
    Great photos and thanks for detailing the step by step.

    It seems you have the Kaby Lake 9560 7300HQ based on your photos. There are a lot of posts here indicating that Kaby Lake is not quite so amenable to undervolting as the Skylake was as it is running much higher clocks in essentially the same package. For the 7700HQ I think people were closer to 120mv to prevent issues but I don't know about the i5 so consider running some serious stability testing or be prepared for potential crashes from aggressive undervolting.

    edit - Oh you might try running the ROG Stress Test for 15 minutes as it is a good workout on the CPU and GPU at the same time. It kills the 7700HQ but a well tuned 7300HQ should be able to do it without throttling...
     
  4. tachlio

    tachlio Notebook Enthusiast

    Reputations:
    0
    Messages:
    24
    Likes Received:
    4
    Trophy Points:
    6
    Yes, I'm using i5 7300HQ as per sig. Will give it a try for ROG later, so far few day undervolt CPU -0.14 had stable with Prime + Game NFS.
    May keep as it now.

    Got a question for iGPU undervolt, so far try -0.10, its seen still had more room to go, but does this really benefit to battery life??
    (3DMark stress test is focus on dGPU, i not sure how to stress iGPU here)

    Surprise the standby time now is 8h+ Previously around 5h+ (56wh battery)
    [​IMG]Battery Life

    Update : ROG Realbench
    CPU : 83c then throttle at 2.5MHz at 74c
    Ambient : 79c then throttle at 2.5MHz at 73c
    GPU : 75c then throttle at 1.3Mhz at 70c
    [​IMG]ROG_Realbench
    At least the Undervolt is stable so far, so I will leave it at the moment.
     
    Last edited: Aug 29, 2017
  5. pressing

    pressing Notebook Deity

    Reputations:
    145
    Messages:
    1,083
    Likes Received:
    420
    Trophy Points:
    101
    Good. You should be able to kill the throttling in the future. This is an interesting thread to follow

    http://forum.notebookreview.com/thr...ures-benchmarks-xps-15-9560-kaby-lake.802345/
     
  6. Philaphlous

    Philaphlous Notebook Consultant

    Reputations:
    14
    Messages:
    249
    Likes Received:
    86
    Trophy Points:
    41
    iGPU undervolt helps marginally. If you look at HWInfo when on your desktop the iGPU doesn't fully ramp up at all so essentially it barely impacts anything at all. I think mine is set to -0.150 or something crazy. lol
     
  7. UHD

    UHD Notebook Guru

    Reputations:
    0
    Messages:
    59
    Likes Received:
    11
    Trophy Points:
    16
    @tachlio

    Thanks for posting the useful photos.

    Which thermal pads did you use? Also the blobs of blutak, where they used just for gauging the height required for the thermal pads but then removed before replacing the bottom cover?

    Thanks.
     
  8. tachlio

    tachlio Notebook Enthusiast

    Reputations:
    0
    Messages:
    24
    Likes Received:
    4
    Trophy Points:
    6
    I'm using Henkel Gap Pad VO
    http://www.bergquistcompany.com/thermal_materials/gap_pad/gap-pad-VOUltraSoft_properties.htm
    - Low Density & Thermal Conductivity
    - A highly compliant material that is ideal for fragile component leads.

    Yes, the plasticine is working like gauge, and I'm stick 2x2mm pad to compare as I dont had caliper on hand.
    It will remove after measure
    Check final condition
     
  9. tachlio

    tachlio Notebook Enthusiast

    Reputations:
    0
    Messages:
    24
    Likes Received:
    4
    Trophy Points:
    6
    I found XTU was delayed startup, it need around 1 min from cool start to effective.

    Anyone try to change it? or how to make it launch faster?

    [​IMG]XTU_Service_Delayed

    Together, I found after PL1 throttled, it took so long to recover back... does this impact performance?

    [​IMG]PL1 Throtte Recovery
     
    Last edited: Aug 30, 2017
  10. pressing

    pressing Notebook Deity

    Reputations:
    145
    Messages:
    1,083
    Likes Received:
    420
    Trophy Points:
    101
    Below is a superb & brief intro to thermals in electronics.

    Shows how engineers do back-of-the envelope heat calculations in layman's terms and why our thermal paste upgrades are so effective:

     
Loading...

Share This Page