The M15x throttle? The final solution!

Discussion in 'Alienware M15x' started by King of Interns, Aug 24, 2013.

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  1. fatboyslimerr

    fatboyslimerr Alienware M15x Fanatic

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    Get a programme like gpu-z or hwinfo and monitor the GPU clock speeds (MHz). Throttle clock for 7970M is 450Mhz. I think throttle clock for gtx 680m is 325mhz. Just minimise while gaming and see if GPU clocks are dipping occasionally

    Sent from my One S running 4.4.2
     
  2. Bele

    Bele Notebook Consultant

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    Just read the entire thread again.

    If I understand this right, I can use another OEM 150W dell brick as long as I yank out said pin, yes? So far, no way other than uspi's mod to ensure I can both charge and game on 7970m, yes?

    For reference I intend to leave the 7970m at stock, undervolted at .95 using svl's mod [expecting it today but customs are taking quite a bit!, might be pushed back to tomorrow]. Also using a 740qm at the moment, planning to grab a 920xm mid year because I found a good price. Looking to OC it at reasonable at a level where reasonable is something that my cooling and ambient temps [usually 34+C] allow.
     
  3. chopsy

    chopsy Notebook Consultant

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    Fps just drops in my case. Core clock does not change, CPU does not change, but GPU usage goes down. It's purely a power issue, the center pin removal fixes it.


    Sent from my iPhone using Tapatalk
     
  4. King of Interns

    King of Interns Simply a laptop enthusiast

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    You should be good with an unlimited 150W with 920xm OC plus undervolted 7970M. Keep in mind however most 7970M's cannot run stable at 0.95V stock. Mine needs 0.975V. You have to find out what your card needs.
     
  5. fatboyslimerr

    fatboyslimerr Alienware M15x Fanatic

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    I average around 180w usage while gaming with x23 multiplier and 1v 900/1450. Definitely need more than 150w PSU IMO.

    Sent from my One S running 4.4.2
     
  6. Bele

    Bele Notebook Consultant

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    Is there a software that lets you see how much power your components draw? I'm looking further into the 920xm/7970m throttle thing and I read over at TI and here that the root cause of this issue is the power draw.

    From what I understand, it's the sheer lack of power that throttles the GPU.

    so it's a 150 watt brick, at 55w for the 920xm and 100w for the 7970, assuming I don't OC the 920xm at all or very slightly if any, would I run into the throttle issue?
     
  7. King of Interns

    King of Interns Simply a laptop enthusiast

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    Pretty much yes. However there is also a hard limit on the amount of voltage you can push through the 7970M. That would be 1.05V which happens to be stock voltage. Any higher and you will get BSOD galore. The mxm slot on the M15x is only able to drive about 100-120W maximum which isn't bad considering it was designed around the GTX 260M which is a 65-70W card.

    The machine is basically designed for 75W tdp cards. 100W cards is pushing it already at stock voltage.

    Anyways yes even a slight 920xm OC can cause throttle. You would do best to either mod your 150W with a switch on the data line (center pin) to be able to switch it off for gaming (throttle free but no battery charge) or buy a second adaptor 210 or 240W are probably cheapest and simply pull the pin out on it to use for gaming. The 150W you can use to charge at night. With the 920xm you will want to run it at least 3ghz across all cores. 3.2-3,3ghz is doable before you need to hard volt mod it (something I am slowly working on)
     
  8. Bele

    Bele Notebook Consultant

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    Duly noted. what's the multiplier equivalent of a 3ghz 920xm? Sorry, not too familiar. Also my understanding, 920xm on stock is 2ghz across all cores, yes?

    I undervolted my 7970m already at 9.5v + stock clocks. she's pretty stable at that with temps hitting 81-82 when running TR with all the dx11 goodness and tress fx. I still get 40+FPS. I think that's pretty good. ALso, very hot country where I'm at. In an air conditioned room, the most TR ever hit was 76C. That being said I think I'm good on the temp end of things.


    One thing I gotta ask regarding batteries and this is out of topic arleady: a year in and my battery's capacity is already down to 25wh from 85wh. Did this baby drain too fast? How do I keep this baby healthy before I replace it? I'm considering just having the cells replaced at my local shop. It's about $8-9 per cell x9 cells then grab a new 150w charger and have that modded by a pro.


    EDIT: at 740qm, I shouldn't be throttling ever, right? I'm totalling 145w based on tech data and that's under the 150w soft cap.
     
  9. King of Interns

    King of Interns Simply a laptop enthusiast

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    Hard to say. You might be okay with the 740qm. 3ghz is 22.5x so at 23x you will be just above 3ghz. I can run mine at 24x in prime 95 full load but 25x shuts one core down. In games 25x would probably be okay. I run 27x on 1 and 2 cores.
     
  10. gdyjggb1st

    gdyjggb1st Notebook Enthusiast

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    Thanks guys ! Problem solved !I reboot my m15x , and everything is normal !
     
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