The M15x throttle? The final solution!

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

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  1. King of Interns

    King of Interns Simply a laptop enthusiast

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    Ok I thought I would start one final thread to end all threads about to how to fix the throttle issues that plagued this machine since it's release.

    The solution is incredibly simple. Irritatingly so! The PSU is the culprit.

    It seems modern PSU's communicate with the laptop and in turn find out which laptop they are plugged into. They then choose whether or not to properly power said laptop. The Slim 240W PSU and all other big modern dell PSU's do the same including the 330W PSU.

    I came to this conclusion when I tried the 210W PA-7E adaptor made by delta for dell. It is an older generation PSU and therefore doesn't seem to communicate in the same way.

    When plug in this PSU it is not recognized by the laptop; it is simply registered in the bios as "unknown" in addition to this the battery doesn't charge. Both 9 cell and 6 cell (I have both) however the laptop runs perfectly fine.

    Now onto the fun stuff. You can game throttle free!!

    So far I have gamed in FC3 at max settings and Crysis 2 with the cpu set to 24/24/25/27! at 85W TDP and 65W TDC and the gpu set to 950/1450 at 1.05V. Not a hiccup nada!!
    I decided to use my cooling mod as it is summer and even with air con the ambient temp is 26C. My GPU maxed at 77C.

    So if you own the M15x and want to get the most out of it buy yourself a Dell 210W PA-7E adaptor. Forget about the 240W slim for good. Another adaptor that might be interesting to try is the 230W Dell adaptor that the M1730 used. I believe this will also work and might be worth some investigation if the 210W adaptor get's tripped by our beast!

    Now the biggest limitation for us is the GPU heatsink. At this OC without my mod temps can easily go into the 80sC. With the cpu able to now run full tilt we also finally have no bottleneck and can be ready for the next generation GPU :D

    edit: final findings:

    Awesome throttling finally fully solved

    Step 1 : Buy a 210W adaptor
    Step 2 : Boot up on the 150W original adaptor.
    Step 3 : Once booted toggle stealth mode on and then off again.
    Step 4 : Change over to 210W and once again toggle stealth on and off again.

    Follow these steps (takes seconds) and you will always have 3D clocks fully attainable without a hint of throttle even with cpu overclocked to 25x across all cores and GPU set up to 1.05V.
    Above 1.05V the M15x doesn't like it however stock voltage is good for 950-1000mhz on the core and 1450-1500mhz on the memory (plenty). This physical power limit of the laptop isn't really an issue as the laptop isn't capable of cooling the 7970M at 1.1V anyway. Temps run away uncontrollably. The heatsink is too small.

    Everyone please enjoy your M15x's. Thanks for everyone's support on this! :D
     
    MZWiZard and ToxicTension like this.
  2. fatboyslimerr

    fatboyslimerr Alienware M15x Fanatic

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    Believe me when I say...my finger is on the trigger to purchase one of these. Contacted 3 eBay suppliers to confirm its the right PSU as a seller on Amazon actually sells 240W adapters in place of these as they are EOL.
    Cambridge Accessories on eBay have the right one for any UK members looking to buy one.

    Only problem is that I'm pretty sure at 950/1450 @ 1.05v I would run into thermal shutdowns left, right and centre. Pretty sure only some DELL cards experience this or it could be related to using too thin thermal pads on the VRAM?
    I guess we'll all have to do King-style cooling mods!

    Excellent work King. In your third throttling thread, you've finally solved it! No more rendering tool for us!

    EDIT: I'm going to link this in my signature because its awesome....if thats ok
     
  3. King of Interns

    King of Interns Simply a laptop enthusiast

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    I ain't done yet. I intend to run some 3dmark11 tests tomorrow and shoot for 1000/1500mhz. If thats ok :D
    I might even be daring and run the cpu at 25x at those clocks and or test out the cpu under prime 95 to see if the new psu unlocks new cpu OC possibilities. This once I have re-applied paste on it.

    Perhaps you could get the 230W adaptor. I would love to see that thing work.

    I am not entirely sure if the new pads are a little too thick. the 1.5mm are perfect and they soft too. The 1mm are very hard though and I worry they might prevent good contact. I hope though with some use they will soften and allow a very solid contact with the heatsink. Must be working though or I wouldn't be getting 77C at the clocks above!

    edit: The 230W model is called PA 19. Seems to look exactly like my 210W. Someone please get one and test!
     
  4. STiHiaL

    STiHiaL Notebook Consultant

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    I'm using the cooper pads with MX-4 to cool down the memory of 6970m. This pads also was on the memory chips of 5850m with CoolLaboratory Liquid pro on the graphics chip when i pushed it to 920/1200/1.15V for everyday use.

    Capture.JPG
     
  5. MorejaSparda

    MorejaSparda Notebook Guru

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    Uhmm all these investigations are very exciting, kudos for King ;)
    I have a question and is this: Is theren´t any "old technology" 240W psu? i mean i.e. one psu from a m18x R-1 or something like that?
    And, on another topic, do you really guys think with theses 1st gen XM processors, even without thottling, we could help the card´s bottlenecking from the future (or a current gen 780m) ?
    I know that cards will have a lower tdp, but when it comes about bottleneck, i thought the horsepower and the card´s technology were the most important, or not?
     
  6. fatboyslimerr

    fatboyslimerr Alienware M15x Fanatic

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    Some games definitely rely on a strong quad core CPU, such as Far Cry 3. Others barely use the CPU, such as Tomb Raider. I've read conflicting articles but generally I think the move is away from using CPU in future games and making them more GPU dependent. Lets wait and see but less CPU usage is good for us as it'll mean we can continue to use the MXM slot in our old laptop and play new games on great settings despite the fact we have a 4 year old CPU :)
     
  7. King of Interns

    King of Interns Simply a laptop enthusiast

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    The cpu is not done yet at 24x I have yet to see any game max it out in the M15x and perhaps I can push it further now. Now if it were matched with xfire or sli configs then it would bottleneck. Single cards we have plenty of power. I have now finished with the cpu. Replaced the old pad over the three chips with phobia 1mm 7wk pad and fresh icd 24 on the core. Let's go fishing :)
     
  8. JohnnyFlash

    JohnnyFlash Notebook Virtuoso

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    Is it 19v or 19.5v?
     
  9. King of Interns

    King of Interns Simply a laptop enthusiast

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    19.5V Most if not all Dell adaptors are.
     
  10. upsi777

    upsi777 Notebook Enthusiast

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    Hi guys,

    I found Out nearly the same thing in the last weeks after upgrading to GTX 680m!
    But there is even more! I was able to get 211W out of my original 150W PSU!
    The thing is you need to connect the PSU in that way that the center pin of the connector makes no contact with the center pin of the M15X power jack (so don't push it fully in). Then the 150W adapter is not recognized, and you are able to get out more than the 180W. This should work also with the 240W PSU!
    ;)
     
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