Dell XPS 15 2-in-1 9575 benchmarks + temps

Discussion in 'Dell XPS and Studio XPS' started by custom90gt, May 11, 2018.

  1. custom90gt

    custom90gt Dellerator Moderator

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    So I just got my Dell XPS 2-in-1 and I figured I would get some benchmarks and temp data out to anyone thinking about buying one. I will be updating this post as I get more info/run more benches.

    Here are the specs:
    8th Generation Intel i5-8305G
    8GB DDR4-2400MHz Integrated
    Radeon RX Vega M GL Graphics with 4GB HMB2 Graphics Memory
    15.6" FHD

    Stock Benchmarks:
    Time Spy - 2253
    Fire Strike - 6261
    Time Spy Extreme - 997
    Fire Strike Ultra - 1615
    PCMark 10 - 4679
    PCMark 8 Creative Accelerated - 5584
    PCMark 8 Home Accelerated - 4219
    PCMark 8 Work Accelerated - 5048
    PCMark 8 Creative Battery Conventional - 14241
    3DMark 11 Performance - 9299
    3DMark 11 Extreme - 2228
    Unigine Heaven Extreme - Heaven Stock.PNG
    RealBench 85,206 - Realbench Stock.PNG
    Farcry 5 benchmark on high settings - Farcry 5 stock AMD.PNG
    Cinebench R15 - 103.57FPS, 640 cb, 153 cb

    Undervolt (-150mv) Benchmarks:
    Cinebench R15 - 107.02 fps, 725 cb, 160 cb
    3DMark 11 Performance - 9438

    Throttling:
    Dell's claim:

    "Performance that packs a punch
    The best. From start to finish: One tiny chip houses both an incredibly powerful 8th Gen Intel® Core™ processor with custom Radeon® RX Vega M discrete graphics plus 4GB of dedicated high-bandwidth memory, so you’ve got the ultimate in creating and processing power in an impossibly thin machine. Get the performance you need for rich content creation, editing or viewing 4K content, high-powered gaming or mega-tasking"

    This guy is going to need a good amount of work to run near its rated speed. I don't think I'll be able to get it there, but I'll sure try.

    Completely stock prime95 causes the CPU to run at 95C and downclock to 2.9GHz while having the fans spin at their max ~5400RPM. I think Dell made the grill openings too small to allow enough airflow. These fans seem to be louder than the 9560 and if it is off of the table it makes an annoying whistling sound.

    As a quick and dirty I undervolted by -100mv and at the same speeds/temps it now runs at 3.4GHz. Still super toasty so I am hoping for good things with a repaste.

    I've been running through the logs and here is the quick summary for undervolting and Prime95 small FFT's for 20 minutes:
    Stock - average temp 91.3C, max temp 96C, average clockspeed 3035mhz
    -100mv undervolt - average temp 91.2C, max temp 94C, average clockspeed 3372mhz
    -150mv undervolt - average temp 85.7C, max temp 89C, average clockspeed 3389mhz

    Somewhat disappointing results from Realbench Stress for 15 minutes:
    Stock - average CPU temp 79, average CPU speed 2774mhz, average GPU temp 68, average GPU speed 994mhz
    -150 undervolt - average CPU temp 78, average CPU speed 2933mhz, average GPU temp 68, average GPU speed 993mhz

    Looking at throttling reasons, it's dell's power limit throttling. Quite the bummer because temps are within reason to allow some additional clocks. I realize it's not a gaming system, but it would be nice if we could push it a little more.


    TL;DR - temps and fan speeds are pretty crazy at full load on this guy. Dell seems to be limiting the max power to CPU/GPU package to around 41w. This guy throttles itself to around 2400mhz on the cpu when the GPU is being used, that's a 30% reduction in speed on the i5 model alone (will be more on the i7).
     
    Last edited: Jul 7, 2018
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  2. custom90gt

    custom90gt Dellerator Moderator

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    Quick repasting guide:
    Remove the T5 screws from the bottom:
    20180512_060359.jpg

    Dell used a ton of plastic clips to hold the bottom in place. I recommend using an old credit card to pry. A note about the part near the screen: the clips are best pried open by going from right to left on the above picture. This will help you not to break any. Remove cover:
    20180512_061038.jpg

    There is a switch that seems to disconnect the battery, but I disconnected the battery anyway:
    20180512_061043.jpg

    Remove the heatsink, don't forget about the 5th screw at the end near the fans:
    20180512_061627.jpg

    Clean the thermal paste off of the cpu/gpu and heatsink. I use arctic clean but that's because I have a ton.

    Apply new thermal paste. I actually spread it out this time because of the odd shapes of the die, but I don't know if that was better or worse than doing a line. Normally I do multiple test runs but sadly I was pressed for time yesterday and only did the one repasting. I used Kryonaut for paste btw.

    Reinstall heatsink, I really am impressed with the quality of the heatsink this time around.

    Reconnect battery/flip the switch.

    Install rear cover. Boot up windows and check those temps.

    Pictures of the VRM area:
    Sorry my cell phone camera was dirty, lol
    20180512_061705.jpg

    Results:
    Here is a quick and dirty. At stock volts running prime95 temps were only 1C cooler since the processor is power throttling. With a -150mv undervolt, temps were ~6C cooler than just the undervolt alone.[/SPOILER]
     
    Last edited: Jul 7, 2018
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  3. custom90gt

    custom90gt Dellerator Moderator

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    Gaming Results
    I was messing around with Farcry 5 and it runs pretty well. The fans sadly run at max the whole time and are pretty loud but the machine itself runs pretty cool because of dell's power throttling. I didn't run FRAPS like I should have to get some FPS numbers so maybe I will do that later.

    With the repaste alone the average CPU temp is 71C, average GPU temp is 67C, average CPU speed 2.8ghz, and average GPU speed ~1ghz.

    With the repaste and undervolt the average CPU temp is 70C, average GPU temp is 65C, average CPU speed 3ghz, and average GPU speed ~1ghz.

    My guess is with better airflow the fans wouldn't have to spin at an annoying 5400rpm to keep the temps at the same level. A laptop cooler may help that, but I don't have one to test.

    Video Encoding
    Doing some encoding tests now.
    I have a 4k HEVC file of Deadpool. I am using handbrake and the "Super HQ 1080p30 surround" preset and only encoding the first chapter of the movie since I don't have all day to watch it.

    Stock - able to power throttle the cpu - 11 minutes and 57 seconds
    -150mv - no power throttling of the cpu - 11 mins and 16 seconds

    During the test the fan noise with the undervolt isn't too unbearable, it gets up there but nothing like at stock voltages. Not a huge difference in time, but that's for a short video. Doing the whole movie would take an extra 19 minutes.
     
    Last edited: Jul 7, 2018
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  4. pressing

    pressing Notebook Deity

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    If you have time, please run RealBench StressTest & Unigine Heaven.

    They both are free and push the XPS units hard. RealBench is nice because it is a good all-around test of CPU & GPU.

    Looking forward to your results here. Big upgrade if you can get this running closer to published specs. . .
     
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  5. custom90gt

    custom90gt Dellerator Moderator

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    Those are on my list to run. I will run them at stock and then with the undervolt to see how different temps are as well. It's hard to not repaste right away but I want to get some good numbers before I do, lol...
     
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  6. pressing

    pressing Notebook Deity

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    It would be fantastic if the -150mv undervolt is stable. That is 6* temp reduction and a good jump in clock speeds with Prime95. As this is the same basic architecture as the Skylake & Kaby Lake but a bit tweaked, I'm suprised it is so happy to undervolt. Maybe the chip quality has ramped up with all the years of production.

    On a few XPS models I could get stable -170mv on 6300HQ and -120mv on 770HQ; I know you had plenty to test. The -120mv undervolt did not have much of an impact on thermals but -170mv really cooled things down. . .
     
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  7. custom90gt

    custom90gt Dellerator Moderator

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    Yeah I'm shocked that it undervolted so well. Thinking back, my i5's have always undervolted better than my i7's though. I tried up to -170 and it was passing prime but when I exited prime I got a BOSD... I think my best undervolt was my first ever 9550 at -180mv though.
     
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  8. custom90gt

    custom90gt Dellerator Moderator

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    Added some more benches as well as results from realbench stress test to the thermals section. Looks like Dell limited the power going to the CPU and GPU at the same time. Will hurt gaming for sure, but at least it'll run cooler. The fans really scream on this though, pretty much max RPM doing anything intensive.
     
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  9. ThatOldGuy

    ThatOldGuy Notebook Deity

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    I think you may actually improve thermals if you remove the Gortex material. It is meant to insulate the heat from the user, which means the aluminum chassis is not dissipating heat. If you don't care about a warm bottom, getting the chassis to be a heat spreader is good.
     
  10. custom90gt

    custom90gt Dellerator Moderator

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    I'll take a look at it when I repaste but until I can get a used back panel I likely wouldn't go to that extreme so I can keep my warranty. I really wish they would have made the spacing in the fan grills just a little bit bigger. You can tell it really limits airflow.
     
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