HP 8740w Cooling Overhaul Mod

Discussion in 'HP Business Class Notebooks' started by Aikimox, Jan 1, 2011.

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  1. Aikimox

    Aikimox Weihenstephaner!

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    HP Elitebook 8740w CPU cooling mod

    Disclaimer: NOT RECOMMENDED! Attempting this mod can damage your system beyond repair and void warranty. You take the full responsibility for messing with your system!


    Materials required:

    [​IMG]

    * an extra dual-pipe CPU heatsink (order from HP Parts Store for 30$), keep the original HS in case of failure.

    * Enzotech DDR-C1 Pure Forged Copper Heatsinks (Newegg 10$) or any other heatsinks/heatspreaders 1.5mm thick, as that's the max you can fit between CPU HS and keyboard)

    * Arctic Silver Thermal Adhesive

    * High performance non-conductive, thick thermal paste with minimal bleed under pressure/temp (I used Tuniq TX-4, for both CPU and GPU)

    * tools for holding, cutting and sanding the copper heatspreaders

    * plastic/metal tray for prepping the active adhesive substance


    The idea:

    The square copper plate in the center of the HS is the core point of our experiment.

    [​IMG]

    The goal is to increase the heat transfer from the copper plate to heat pipes, since the pipes are soldered to the plate from above (instead of being submerged into it) thus there's a very little contact area between the pipes and HS.

    [​IMG]

    ..................................................
    Preparation Step:
    ..................................................

    You'll need to carefully measure and cut the copper heatspreaders into 3 pieces (if you could find a proper copper plate to make a single piece - would be better) in such a way that the pieces don't touch the HS screws. Also, keep in mind, you'll need to be able to insert the modified HS in its place.

    ....................................................

    Main Phase:


    AS Thermal Adhesive comes in two tubes that when mixed together will become active and you will have only a few minutes to do the job. Use rubber gloves for this stage and mix the contents of the tubes in a plastic or metal tray. Stir thoroughly using the plastic stick that comes with the package. Next, use the same stick to fill in the gap between the heatpipes
    (the black zone on the pic below) with the active compound, then put a thin layer on tops of the pipes (the gray zone).

    [​IMG]

    Next, place the heatspreader pieces over the pipes, press and hold them in place for a couple of minutes, they will be glued to the HS permanently :)
    Sorry for not taking pics during this stage, had just a couple of minutes to make things right - the adhesive cures very fast and there's no second attempt.

    [​IMG]

    Next, install the HS, replace the thermal compound on the CPU and GPU and enjoy the results! :cool:

    Results:

    I wasn't too sure about the effectiveness of this mod but after seeing the temps stay under 78-79C in Prime95 (room 28C) after 30min of stressing, compared to 86C after 10min before the mod. Idle temps went down 2-3C on the CPU.
    3Dmark11 maxed at 67C for the CPU and 64C for the GPU.
    King's Bounty TAP maxed at 68C for the CPU and after a 24hrs of stressing, gaming and office mode max CPU temp was 71C, which is not bad for a 840QM and 27-30C ambient. I will run more tests later but so far it seems that there is a 6-9C reduction in max CPU temps, which gives hope for upgrading to 940XM and OCing it.
     
  2. Aikimox

    Aikimox Weihenstephaner!

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    Reserved.....
     
  3. Jeezo

    Jeezo Notebook Consultant

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    you're luky i'm not in your area , cause i would hire you for a pimp my elitebook job !

    Excellent pots ..
     
  4. m8o

    m8o Notebook Evangelist

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    There's clearly an answer to that. SnailMail / FedEx / UPS / DHL / PonyExpress / PackMule ... no need for you to visit in person.

    Really loving the post Aikimox, even if I don't think I'll be needed to go that far. I've been thinking I need an extreme processor for the performance I expect, maybe not [I'll be making a post about why in a few days], but in any case I won't necessarily need this. Still great to see it's possible and see it done.

    BTW, I'm guessing you never got your D-SLR? The replacement of the K-x I'd mentioned, the K-r, has the only thing that was missing from the K-x, viewfinder feedback. And the K-5 [which was finally everything I expected and I'd been waiting to upgrade to] is keeping up w/the cameras 3x its price. ;) Else if you're open to that pricing territory I'd also recommend the Nikon D7000 which is almost a twin performance-wise to the K-5 even if I'd still give the ergonomics nod to the K-5.
     
  5. Aikimox

    Aikimox Weihenstephaner!

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    ^^ D-SLR is postponed for a couple of months :( I appreciate your advice and will surely dive into it as soon as I can.
     
  6. Jeezo

    Jeezo Notebook Consultant

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    :) ok so let's guess what Aikinox can do to my poor 8540w
    I5 560M
    4b
    1600*900

    ?

    Not that much ....a i7 640M that will be less than 10% increase ...
    Screen ? i'm interested ..
    Ram i'm on 32bits
    if he tells me he can put me a I7 Qm on , bingo ...but i know he's not a magician !
     
  7. Aikimox

    Aikimox Weihenstephaner!

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    The only question here would be "How much $$$ are you willing to spend?" :p
     
  8. Charles P. Jefferies

    Charles P. Jefferies Lead Moderator Super Moderator

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    Very nice job on the mod, Aikimox; those are some impressive results. The more surface area a heatsink has, the more heat it can dissipate; that's why all those high-end desktop CPU coolers are so big.

    I'm curious to see what kind of difference this could make with a i7-940XM + FX5000M-equipped notebook; they get quite toasty with the stock cooling solution.
     
  9. Aikimox

    Aikimox Weihenstephaner!

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    Thanks, Charles!
    Wish I had a 940XM to answer those questions.
    Also, even though it's possible to use RAM heatspreaders for the CPU HS (as in our case) and probably add many tiny copper plates on top of the GPU HS, the improvement is limited by the small size of the radiators and a single fan.
    Still, the improvement is noticeable.
     
  10. Siorah

    Siorah Beware of Squirrels!

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    i've ordered some parts and will try it with my 920xm overclocked. we shall see what results we get.

    atm it sits on almost 100c overclocked by 10% i don't have a 5000M anymore to play with, (work wouldn't let me anyway!) but i can try it with the 2800M

    we'll see how it goes. atm waiting for the bits.
     
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