Aluminum Mid 2007 iMac 2.4 GPU Upgrade

Discussion in 'iMac' started by iMouse, Jun 29, 2009.

  1. iMouse macrumors regular

    Joined:
    Jul 23, 2002
    Location:
    Boardman, Ohio
    #1
    In the past, conversations over the upgradability of the iMac's GPU has sparked the interests of some rather talented individuals. I would like to revisit this a year later to see if anyone has attempted to perform the following.

    Upgrade a 20-inch Mid-Late 2007 Aluminum iMac 2.4 from a Radeon HD 2600 Pro to a GeForce 8800GS.

    Since I had to tear my iMac apart in order to replace a failed hard drive, I decided to also remove the logic board and GPU heat pipe to properly reapply thermal paste. For all of you who have been reading up on the MBA thermal paste debacle, you'll be pleased to know that it isn't just the MBA with gobs of thermal paste covering CPU/GPU dies. My iMac was just as bad with thermal paste spilling over the die, onto the chip surface and hanging from the copper heat pad.

    ...anyway. I am rather unfamiliar with the difference between the heat pipe on the 20" vs the 24" and am currently looking for info/pics. Also, if it is possible that the cards are swappable, does the heat pipe sit over the GPU and GDDR to allow for heat transfer? I don't have a 24" to compare with my 20" and most of the detailed photos I've found online point more to 20" teardowns and not the 24".


    I guess what I'm asking are three things...

    1. Is there someone who has worked with 20" and 24" iMac logic boards that may have insight on whether the heat sinks are interchangeable or the existing heat sink on the 20" will touch the right spots on the 8800GS?

    2. Are both of these cards MXM-II or III? I'm getting mixed answers as to whether both are MXM-II or MXM-III.

    3. An open mind. Warranty is up, machine is in pieces right now. I don't care about heat/power/cost. If it'll fit (and operate), I'm prepared to do this.

    I'm even possibly considering upgrading the processor to the fastest bus-compatible Merom available.


    Any thoughts, experiences, etc that you might be able to provide are greatly appreciated. :)
     
  2. craig1410 macrumors 65816

    craig1410

    Joined:
    Mar 22, 2007
    Location:
    Scotland
    #2
    Hi,
    Just came across your post as I have a similar question and wondered if you managed to upgrade your GPU?

    I'm hoping I can upgrade my 24" 2.4GHz Mid 2007 iMac from a 2600 Pro to an 8800GS to take advantage of the OpenCL stuff in Snow Leopard.

    Let me know how you got on.

    Cheers,
    Craig.
     
  3. JeepGuy macrumors regular

    Joined:
    Sep 24, 2008
    Location:
    Barrie
    #3
    the GPU on a 24" Imac is on a separate card, and can be upgraded, but it's 500USD for this card, you would be better off selling your current system, and buying a new one. As for the 20" there is no 8800gs upgrade path.
     
  4. craig1410 macrumors 65816

    craig1410

    Joined:
    Mar 22, 2007
    Location:
    Scotland
    #4
    I wasn't planning to buy one new, I was hoping to pick one up on ebay or something, recovered from a faulty iMac perhaps. I would have thought that there would be some availability of recovered parts from aluminium iMac's by now. Just evaluating my options really.

    Thanks for your reply,
    Craig.
     
  5. zedsdead macrumors 68040

    Joined:
    Jun 20, 2007
    #5
    Right now, no apps are supporting OpenCL (as far as I know). Until there is a specific app you use that will offer a significant boost, I say do not bother.
     
  6. SomeSwede macrumors member

    Joined:
    Feb 26, 2009
    Location:
    Land of ice and snow.
    #6
    It can be done? Got any link with relevant information?
     

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