M17xR2 Power Supply Shutdown with AMD 8970m

Discussion in 'Alienware 17 and M17x' started by alexnvidia, Jun 30, 2018.

  1. TheReciever

    TheReciever D! For Dragon!

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    Kill-a-watt is really cheap
     
  2. BA0701

    BA0701 Notebook Geek

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    This became a major issue just about any time I would play taxing games, with my previous 780M. At that time, I also noticed my gpu temps lingering near, and sometimes slightly above 100C. So, I cleaned my gpu and cpu, repasted them both, and even through in a copper shim on each, and my heating issues dropped tremendously, and as a result, my power supply quit tripping as well.

    Not sure if it is related, or what the average temps should be with your gpu, and what they are, but worth looking at.
     
  3. alexnvidia

    alexnvidia Notebook Deity

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    thanks for your input. my temps are actually really good. GPU when not OC, leveled off at 71C when fans are on high. If i OC to 1GHz+1.35GHz TDP 81W, it will level off around 75-76C. CPU OC to 3.5GHz TDP 75W will max out around 80C.

    What GPU are you using now? is your 240W PSU still alive and working well?
     
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  4. alexnvidia

    alexnvidia Notebook Deity

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    Just an update for those who are interested.

    Got my second 240W flextronics PSU. My original PSU was delta 240W.

    The flextronics PSU allows me to push my GPU to 1GHz Core, 1350MHz Memory @ 1.025V, 81W power limit with CPU @ 26x 75W TDP 65A TDC stable

    If my CPU is set to 26x 82W TDP 62A TDC, even the flextronics 240W will shut down when i run 3DMark firestrike combined test.

    This somewhat confirmed my delta PSU 240W is not capable of delivering enough power to the laptop. However, i'm still puzzled at why even the flextronics 240W PSU shut down when i set the CPU TDP to 82W. 240W PSU should be more than capable of running a single 940XM overclocked and a single 8970M overclocked especially when 8970M has a power limit of 81W by default.

    GPU 81W + CPU 82W = 163W

    Let's say the GPU is capable of drawing more than 81W because it's overclocked, at the speed and voltage i'm running the GPU could be drawing 130W?

    GPU 130W + CPU 82W = 212W.

    Even so, that should have plenty of room left to drive the rest of the system components like LCD, HDD, SSD, Motherboard etc. This can't be right. i've seen forum members running TWO 8970M and 940XM no OC on a 240W PSU and non of them ever reported power supply shut down.

    The old delta 240W PSU is only capable of running the GPU undervolted to 0.975V, 925MHz 1350MHz 80W power limit and CPU 26x 62W 62A. anything more will cause the PSU to shut down.

    I'm not from the US, so getting a kill-a-watt is not easy, not to mention the plug and voltage is not compatible even if i import one in.
     
  5. Grant B Gibson

    Grant B Gibson Notebook Deity

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    Pro tip, 8970m is a 100W GPU, not 75W. Yeah, who knows why your stuff is shutting down, it could be that your DC/IN jack is slowly failing, that seemed to be a prominent issue with other M17X R2 users. My own stopped being able to charge, and I'm still figuring it out
     
  6. Grant B Gibson

    Grant B Gibson Notebook Deity

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    Oh I forgot to add, you can't just factor in CPU+GPU and call it a day, you also have to keep in mind HDD/SSD's, Screen, Motherboard, RAM all take up power, around 20-30W total
     
  7. alexnvidia

    alexnvidia Notebook Deity

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    yes i did factor in other components as i had stated in the previous post. and also, i had my jack resoldered when i started having PSU not recognized problem. but even after resoldering it, nothing changed. how's your psu?
     
  8. Grant B Gibson

    Grant B Gibson Notebook Deity

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    So youre probably just reaching over the threshold of the PSU then. The people with dual 8970ms have the 330W PSU with a 240W chip ID, it cant support 330w natively, but it can with the mod. There is no way you can run a OCed i7 940xm or 920xm with two 8970ms on 240w AC, its impossible. I haven't resoldered my DC/IN jack, Idk if I am going to tbh. PSU worked with my ranger, but couldn't charge it
     
    Last edited: Jul 23, 2018
  9. Raidriar

    Raidriar Notebook Prophet

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    Just for reference, I ran 3dmark 11 to give you a baseline. 940xm running at 25-25-25-25 and a single 8970M running at 900/1250 undervolted to 0.975V (instead of stock 1.025V-1.050V) pulled 185W from my power meter. Safe to say you are probably tripping the power shutdown since you can't power everything with just a 240W power supply pushing the CPU to 26-26-26-26 and 1.025-1.050V 8970M.
     
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  10. alexnvidia

    alexnvidia Notebook Deity

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    thanks for your reference input. that helped to answer a lot. hard to imagine even an undervolted 8970M with a 25x CPU is already pulling 185W. If that's the case i've definitely blown past my power budget. Right now i'm running stable on 26x 75W TDP 65A TDC CPU and 1GHz 1350MHz GPU with vbios TDP limit 81W.

    Just to check with you, when you pull 185W with your CPU @ 25x, what is your TDP and TDC in throttlestop?
     
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