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    Upgrade i7-720 with i7-640 on HP 8740

    Discussion in 'HP Business Class Notebooks' started by inbomba, Apr 12, 2011.

  1. inbomba

    inbomba Newbie

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    Hello!
    I have an 8740W with intel i7-720. I'm interesting to replace this processor with Intel i7-640. It' possible? the mainboard of this configuration support the dual core??

    Thanks
    see you!!
     
    inbomba, Apr 12, 2011
    #1
  2. Siorah

    Siorah Beware of Squirrels!

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    yep it's possible to go from a quad core to a dual core, but remember you are limiting the speed of the memory to 1066Mhz, as well as only being able to use 16GB (max) of ram.


    good luck.
     
    Siorah, Apr 12, 2011
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  3. inbomba

    inbomba Newbie

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    Thanks Siorah!
    well i try to replace the processor... but the notebook don't start!
    the light of notebook turn on... but don't make the boot and the monitor is black!
     
    inbomba, Apr 12, 2011
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  4. Siorah

    Siorah Beware of Squirrels!

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    hiya what bios are you running on the notebook?

    and are you running 4 memory sticks?

    I wasn't able to get a 640M to test, so it might be a bit different to the 620M
     
    Siorah, Apr 12, 2011
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  5. ktbpylon

    ktbpylon Notebook Guru

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    Sorry to hijack the discussion, but is there any word on accomplishing the opposite - placing a quad core CPU into a dual core MB? My elitebook has an i5-520M. If I also get a quad core heatsink and stick to 8GB ram combined, would it work in theory? Or is an i7-620M as high as I could go?
     
    ktbpylon, Apr 12, 2011
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  6. inbomba

    inbomba Newbie

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    Hi!
    Yes i have 4 module of 4gb for 16 gb total.
    do you think i must use only 2 module with dual dore?
    The bios is upgrade to last version

    Thanks
    see you!
     
    inbomba, Apr 13, 2011
    #6
  7. Siorah

    Siorah Beware of Squirrels!

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    yea, take 2 modules out and it'll work.

    seems the 640M won't work with 4x4 modules
     
    Siorah, Apr 13, 2011
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  8. Siorah

    Siorah Beware of Squirrels!

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    yea it will work the other way around from past experience.
     
    Siorah, Apr 13, 2011
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  9. Siorah

    Siorah Beware of Squirrels!

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    wow very interestingly i did a test in my machine with the 620M and now the girl won't boot with 4 sticks either

    seems bios has changed this.

    :(
     
    Siorah, Apr 13, 2011
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  10. inbomba

    inbomba Newbie

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    Thanks!
    I will try with 2 module of ram!!!
    I'm not sure... but Dell have a model (Precision M6400) with dualcore with intel i7-640 and 4 slot of ram for total 16 gb of ram!
     
    inbomba, Apr 13, 2011
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  11. jalaj

    jalaj Notebook Geek

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    As long as your elitebook has dedicated video, then yeah it'll work. Otherwise you'll find out that you have no video, because the Gen1 quad mobiles don't have integrated video.
     
    jalaj, Apr 14, 2011
    #11