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    Asus ROG Zephyrus G14 Owner's Lounge

    Discussion in 'ASUS Reviews and Owners' Lounges' started by undervolter0x0309, Jan 26, 2020.

  1. Biker Gremling

    Biker Gremling Notebook Evangelist

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    Which resistors are the ones to shunt mod? I might be interested in doing this to my G14.

    Enviado desde mi GM1913 mediante Tapatalk
     
  2. seanwee

    seanwee Father of laptop shunt modding

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    What vrms does it have?
     
  3. thesacredmoocow

    thesacredmoocow Notebook Enthusiast

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  4. seanwee

    seanwee Father of laptop shunt modding

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    Yup, I'm familiar with those mosfets, my GS75 uses the same ones in fact.

    Are you sure it's 5 phases for the gpu only or is it divided between the gpu and vram.
     
  5. thesacredmoocow

    thesacredmoocow Notebook Enthusiast

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    Also, in regards to the hardware ID, I found somewhere that nvidia gpus use resistors on the pcb to determine the pcie address, maybe its possible to switch out a resistor to set the new address? (1f12 to 1f15)
     
  6. thesacredmoocow

    thesacredmoocow Notebook Enthusiast

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    I can send pics but there looks to be two more phases seperate from the cpu/gpu vrms which I'm assuming is for vram. There's also 4 phases for the cpu I'm assuming, guessing purely based on proximity to the actual components.
     
  7. seanwee

    seanwee Father of laptop shunt modding

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    Maybe but its beyond my expertise.

    Sure, send them over.
     
  8. Biker Gremling

    Biker Gremling Notebook Evangelist

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    There are 2 phases for vRAM. [​IMG]

    Enviado desde mi GM1913 mediante Tapatalk
     
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  9. thesacredmoocow

    thesacredmoocow Notebook Enthusiast

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    Link to imgur album: https://imgur.com/a/rVSDrpm

    let me know if you need pics of anything else

    This is purely anecdotal but I suspect the g14 was originally designed for a stronger gpu. the datasheets suggest that each phase can do ~45w so even at half capacity there's plenty of headroom. There's also a heatpipe solely dedicated to vrm cooling. The 2060mq was debuted on this laptop, maybe it was originally designed for something else but switched to it once it became an option?
     
    Last edited: Sep 29, 2020
  10. thesacredmoocow

    thesacredmoocow Notebook Enthusiast

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    One other thing I noticed was that the motherboard apparently supports perkey rgb. wonder if its possible to add that back in, since some preproduction models had it
     
  11. seanwee

    seanwee Father of laptop shunt modding

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    Actively cooled as well, very nice.

    Ok, what you're looking for are two R005 marked components that are in close proximity with each other and the vrm of the gpu.

    On my Zephyrus G it was on the other side of the motherboard

    20200227_101946_compress64.jpg
     
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  12. thesacredmoocow

    thesacredmoocow Notebook Enthusiast

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    I would've assumed that these resistors were placed in parallel to the power circuit, but judging by the thick traces are they in series with the gpu directly?

    Sent from my BND-AL10 using Tapatalk
     
  13. Biker Gremling

    Biker Gremling Notebook Evangelist

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    The fans on the G14 are stupidly powerful on full blast. I think they asked nVidia for the 2060 max-Q because a max-P 2060 or 2070 max-Q would make the laptop chassis too hot to use. However, if you use the laptop for gaming with an external monitor an input devices on a cooling pad, the extra heat is not an issue.

    A slashed feature for god knows why. Cost? Problems sourcing the keyboards? Bean counting? Who knows!

    I don't have the laptop disassembled right now, took that picture when I did the repaste some weeks ago.

    However, if you tell me the resistors I have to purchase for the shunt mod, I can get them and disassemble the laptop again and search for the R005 Resistors on the back.
     
  14. thesacredmoocow

    thesacredmoocow Notebook Enthusiast

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    My understanding is that it depends on how much power you want it to actually draw. I would guess that it can do ~90W alright. My calculations say that you would need to put a resistor of 0.01ohms on top of the current resistors to achieve this, but seanwee should probably check over that.
     
  15. seanwee

    seanwee Father of laptop shunt modding

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    The Vrms can handle 150w just fine. But I doubt the cooling system can.

    Soldering 0.01ohm resistors on parallel will give you 97.5w of power to the gpu give or take.

    The next step up would be soldering 0.005 ohm resistors in parallel which will double the stock tdp to 130w.

    Pick your poison. Personally I would go for the 130w option and see if the system can handle it. If not, try maximising the cooling by using a lapped heatsink + carbonaut (works as well as Liquid metal).

    If it still can't handle it, undervolt the gpu.
     
  16. thesacredmoocow

    thesacredmoocow Notebook Enthusiast

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    repasted with mx4 I'm getting ~70c temps pinning only the gpu. That's 17c of headroom from the 87c nvidia defined limit. I thought max-q cards didn't have adjustable voltages though?
     
  17. seanwee

    seanwee Father of laptop shunt modding

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    Techinally undervolting = overclocking on gpus as you're increasing the clock speed at a given voltage.

    The only difference is that with "undervolting", you apply the highest stable overclock first, then you flatten the voltage frequency curve from a desired voltage/frequency point onwards.
     
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  18. Biker Gremling

    Biker Gremling Notebook Evangelist

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    The problem is not how much the GPU can take, but rather how hot you want the CPU to run. Due to the design of the G14, the hotter the GPU runs, the hotter the CPU gets in games. In my experience, running the CPU thermal throttling causes instability on long gaming sessions.

    I think I will go for 0,02 ohm (78W). That is a power I know it won't cause issues and mess things up too much.
     
  19. seanwee

    seanwee Father of laptop shunt modding

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    I calculated 81.25w with 0.02ohm resistors.

    Anyways, what do you mean unstable? In what way is it unstable?

    I run my Zephyrus G right up to the gpu thermal limit and stability is fine. Cpu clocks are a bit lower but performance or stability isn't affected.
     
  20. thesacredmoocow

    thesacredmoocow Notebook Enthusiast

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    huh. afaik the cpu is designed to go up to 105c and only starts throttling in the 90s. in most games the game is cpu bound, mine at least runs in the 60s when playing a game (with boost off). Let me know how hot the gpu gets and what clocks its sustaining? I was originally thinking 90 or so watts since that's the default value for 2060mp, but they also go up to 115 so if you don't hit thermal limits instantly I might go a bit hotter
     
  21. thesacredmoocow

    thesacredmoocow Notebook Enthusiast

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  22. Biker Gremling

    Biker Gremling Notebook Evangelist

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    I have been looking at resistors to purchase but don't know if to go for 500mW or 1W types.

    When I got my G14 something I did was to game for very long sessions to see if this could really become my main laptop (the one for not only work, but for also to game on). Something I noticed was that the CPU would constantly hit 105C, and after a while it would BSOD (this was using an external monitor and a cooling pad). Disabling boosting would remove this problem, but the best solution was to use Ryzen Controller (now I run ~25W for games). I estimate that between the repaste, limiting the CPU to 20W, cooling pad and running full fans, 80W on the dGPU is possible.
     
  23. thesacredmoocow

    thesacredmoocow Notebook Enthusiast

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    maybe try repasting? even with boost on I haven't gotten temps that high. 90s at the most.
     
  24. thesacredmoocow

    thesacredmoocow Notebook Enthusiast

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    My PCIE bus from hwinfo reads ~20v so I'll assume that that's the input voltage. at 200W that's 10a, plugging it in, V=10(0.005) = 50mV at 10a being dissipated by the both of the resistors, which is 500mW. Since there is actually less current going through the additional resistor (unless you try to go higher than 130W) the resistor should be dissipating 250mW at the most. 500mW resistor should be enough.

    Edit:

    R2 = (W1*R1)/(W1-W1) and W2 = (W1*R1)/R2 + W1

    Where R2 is the additional resistor, R1 is the original Resistor, W2 is the desired resulting wattage, and W1 is the original Wattage
     
    Last edited: Sep 30, 2020
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  25. Biker Gremling

    Biker Gremling Notebook Evangelist

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    Well, so today I decided to disassemble my G14 and remove the motherboard to see if there were the resistors to shunt on the back. After a nerve wrecking experience (due to the glued keyboard flex cable), this is what I found:

    [​IMG]

    As it can be seen in the picture, the resistors marked as 4 are present, but these seem to be for measuring the power that comes from the barrel plug. Now, if we peel the cover from the motherboard top...

    [​IMG]

    There are these resistors, but they seem to go to the indicators LEDs. Since there's nothing in the back of interest (that I can tell), let's see what we've got at the front.

    [​IMG]

    So, resistor No 3 if for the battery. I don't know what resistor No 2 is for. There's an R005 marked resistor (No1), but that doesn't seem to be for the GPU. But, what is under that cover next to the SSD?

    [​IMG]

    Aha! More R005 marked resistors, and these are over at the GPU side.

    Now comes the interesting part. Without the cover on, I ran Valley Benchmark and tried measuring the Voltage drop on resistors 1 and 6, but unfortunately I couldn't detect any voltage drop. I tried on resistor 3 and measured a drop of 0,02V.

    So now, the big question: What resistors are the ones to shunt mod? Do I have to keep searching?
     
    Last edited: Oct 1, 2020
  26. seanwee

    seanwee Father of laptop shunt modding

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    The resistors marked 6 are most likely the ones you are going to shunt mod, they are exaclty the same ones that were used im my zephyrus G.

    The problem is, they seem too far away from the gpu vrms. Can you take a picture of the components in the area around the gpu vrms? Also look for any other R005 marked resistors on the board.
     
  27. thesacredmoocow

    thesacredmoocow Notebook Enthusiast

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    Perhaps they are under the metal covers around the gpu? It does seem odd that it's on the other side of the gpu as the vrms...

    These appear to lead to the vram vrms? Are these a separate component circuit from the cpu/gpu vrms? I don't see a separate voltage controller
     
    Last edited: Oct 1, 2020
  28. Biker Gremling

    Biker Gremling Notebook Evangelist

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    Since I have enough leftover thermal paste, I'm going to remove the heatsink and see what is under the heat shields. Hopefully we find there the elusive resistors.
     
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  29. thesacredmoocow

    thesacredmoocow Notebook Enthusiast

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    Let us know what you find. Looking at the pictures again, I suspect that #6 is for the gpu. 1, 2, and 3 Im guessing are for the barrel plug, PD, and battery, respectively. It doesn't make sense that anything else nearby would require current sensing, let alone that much amperage judging by the thickness of the traces.

    Sent from my BND-AL10 using Tapatalk
     
  30. Biker Gremling

    Biker Gremling Notebook Evangelist

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    So no R005 resistors under the shields.

    I'm pretty certain that the resistors under the cover next to the SSD are the ones for the GPU. I say this because they are next to an "ite" voltage regulator, and those are generally used for GPU power delivery control.

    The reason I might not be able to measure any voltage drop on these resistors may have been due to the multimeter not having enough resolution to pick up the voltage drop.

    I will have to come up with a test or something to find out if these resistors are truly the ones for the GPU. [​IMG]

    Enviado desde mi GM1913 mediante Tapatalk
     
  31. thesacredmoocow

    thesacredmoocow Notebook Enthusiast

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    my math says that you should expect a drop of 0.005ohm*(65W/20v) = 16.25mV voltage drop across a resistor. I just tested with a multimeter with 0.1mV resolution, and I was getting ~4mV on idle, and 16.4mV doing a GPU benchmark. makes complete sense considering the inefficiencies that happen throughout the circuit. I think its fair to say that we can be 99% certain that those are the shunts we need to mod.
     
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  32. Biker Gremling

    Biker Gremling Notebook Evangelist

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    Well, well, well. So this night I picked up my pro multi meter from my parents home and decided to test the resistors. I set up the laptop upside down and hooked up an external monitor and peripherals. Just look at this, I was totally mesmerized with this set-up for a while:

    [​IMG]

    Now recalling my previous post, we had R005 resistors 1 and 6A and 6B

    [​IMG]

    So what I did was run Valley again and probe the resistors and measure the voltage drop. As mentioned by @thesacredmoocow , we should be around 16mV, and I measured about 17~16,6mV on resistor 6B. For 65W and a reported voltage of 19,2V, being the target about ~16,8mV, we were on point.

    Now, the question is what are resistors 6A and No 1 for. My answer is that I don't know. Resistor No 1 would randomly go from 0V drop up to 55mV drop and everything in between without any relationship to the GPU or CPU test running. Resistors 6A however was a mix of both GPU and CPU activity, ranging from 0,5mV up to 12mV. I honestly don't know what could cause this, but my suspicion is system RAM.

    However, from the observations made, I can conclude with 100% certainty that resistor 6B is the one dedicated to the dGPU. Now is a matter of ordering the resistor for the shunt mod and getting on with the soldering iron.
     
  33. thesacredmoocow

    thesacredmoocow Notebook Enthusiast

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    huh interesting. From all the other shunt modded laptops the process always involved modding two resistors or more, I guess you may only have to do the one for this laptop?
     
  34. Biker Gremling

    Biker Gremling Notebook Evangelist

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    It does seem like it.

    Enviado desde mi GM1913 mediante Tapatalk
     
  35. seanwee

    seanwee Father of laptop shunt modding

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  36. Biker Gremling

    Biker Gremling Notebook Evangelist

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    Where did you find that information?

    Enviado desde mi GM1913 mediante Tapatalk
     
  37. thesacredmoocow

    thesacredmoocow Notebook Enthusiast

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    I assume that's just how it works for most if not all turing laptops

    Sent from my BND-AL10 using Tapatalk
     
  38. seanwee

    seanwee Father of laptop shunt modding

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    Why testing of course!
     
  39. thesacredmoocow

    thesacredmoocow Notebook Enthusiast

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    @Biker Gremling I ended up going with WSL12067L000FEA and ERJ-3LWJR010V resistors from a local canadian supplier if you're still looking for resistor suggestions. Apparently other ppl have used the 1206 form factor, so that size should be good.

    Sent from my BND-AL10 using Tapatalk
     
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  40. Biker Gremling

    Biker Gremling Notebook Evangelist

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    How do you test for GPU memory?
     
  41. thesacredmoocow

    thesacredmoocow Notebook Enthusiast

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    This is unrelated but does anybody know what are the pci-e lane specs of the wifi card slot? I believe it's a pci-e 3x4 slot but I can't find any info about that.
     
  42. seanwee

    seanwee Father of laptop shunt modding

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    shunted it then checked power draw using hwinfo
     
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  43. thesacredmoocow

    thesacredmoocow Notebook Enthusiast

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  44. Biker Gremling

    Biker Gremling Notebook Evangelist

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    I guess the banter just got real

    Enviado desde mi GM1913 mediante Tapatalk
     
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  45. clayton006

    clayton006 Notebook Evangelist

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    So I'm cross shopping this with the blade 13 120hz system. I've got already an area 51m so I don't need something earth shattering in terms of gaming performance.

    I'm wondering if the 120hz screen still has ghosting?

    How are thermals in a device such as this?

    I plan to use it for work and some light gaming. Maybe one windows vm with 8gb of ram for work tasks. And having the ability to usbc trickle charge would be great.
     
  46. seanwee

    seanwee Father of laptop shunt modding

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    The screen has ghosting, thermals are outstanding as it handles shunt modded 2060 Max-qs like a champ.
     
  47. custom90gt

    custom90gt Doc Mod Super Moderator

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    Lol, says the person I just bought a RB15 from. I do see ghosting with fast paced games, however I'm not one that plays online much anymore compliments of my long work hours. Thermals are indeed great on the laptop for sure though, and the battery life is good. The only issue I could see with your use base is that it has 8gb of soldered ram and 8gb of replaceable ram. You can do a larger stick and have some additional ram that is not dual channel, but that's not optimal.
     
  48. clayton006

    clayton006 Notebook Evangelist

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    Yeah the ram isn't a big deal as I could get it up to 40. My issue is the display. I'm a display snob admittedly. Feeling like this one will end up letting me down a bit.

    Hopefully you get your laptop soon and enjoy it!

    Edit: That was my 500th message as well!
     
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  49. Donald@Paladin44

    Donald@Paladin44 Retired

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    Yes, you can go to 40GB, but only 16GB of it will be in DUAL CHANNEL, the rest will operate at about half speed.
     
  50. Donald@Paladin44

    Donald@Paladin44 Retired

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    Just a head's up...we are down to 5 pieces remaining of the ASUS ROG Zephyrus G14 AniMe Matrix Moonlight White Laptop-Gaming
     
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