Core 2 Duo (Merom) runs Win XP Pro 64?

Discussion in 'Windows 64bit' started by David Fumento, Oct 26, 2006.

  1. Will Win Xp Pro 64 run on the newest Thinkpad X60 and T60 laptops which use
    the Core 2 Duo (Merom) chip? The processor has a 64-bit mode, but I have
    that laptops will not support the 64-bit until the Santa Rosa chipset comes
    out in the Spring. In other places, I have read that there is a Napa64
    platform/chipset in the current Core 2 Duo units and that indeed Win XP Pro
    64 will work.

    So, will today's Core 2 Duo laptops support Win XP Pro 64 or do we have to
    wait until Spring for the Santa Rosa platform/chipset?

    Could someone please verify this with a working system of either Win XP Pro
    64 or Vista 64 or Linux 54?

    David Fumento, Oct 26, 2006
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  2. The answer is simple - if the processor supports EM64T, then it will run
    x64. If you go to the Intel web site, you can verify what your processor

    So far as I know, all Core 2 Duo procs are EM64T. Core Duo, procs, OTOH, are
    NOT EM64T.
    Charlie Russel - MVP, Oct 26, 2006
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  3. Thanks but there is a chipset dependency in addition to the processor
    itself. That is, it is possible to use a chipset that precludes an otherwise
    64-bit capable processor from running 64-bit code.

    This is from an email from Intel:

    From: Latscha, Denise [mailto:]

    Sent: Thursday, October 26, 2006 3:02 PM

    To: David Fumento

    Subject: RE: Thinkpad X60, T60 notebooks w/Core 2 Duo (Merom) run Vista-64?

    Hi David,

    I need to ask you to contact Lenovo on this one. There are different
    versions of the Napa chipset, some of which support 64-bit computing and
    some which don't. They will need to confirm which is which. The processor is
    an Intel® 64 architecture-based processor, so that is covered. The other
    question you will need to ask Lenovo is which platforms have qualed on Vista
    (or when).

    Thanks and ciao Denise




    This move to the Core 2, code-named Merom, is something of an interim step,
    with a more significant upgrade expected in Spring, 2007. The Merom
    processor is a new design that can swallow instructions and data in 64-bit
    bites-helping the computer handle bigger tasks more quickly than earlier
    chip iterations. *****But because of limitations in supporting chips, which
    were designed for older processors, it is limited to 32-bit operation. *****

    In early spring, Intel is expected to release a new "chip set," code-named
    Santa Rosa, that will allow the Core 2 Duo processors to operate up to their
    full potential. I expect Apple will do another refresh of its line soon
    after the Santa Rosa chips become available.


    Would someone from Microsoft or someone that actually knows tell me if
    Thinkpad T60 and X60 with Core 2 Duo processor actually run 64-bit code?

    IBM/Lenovo presales and tech support do not know the answer to the question.

    There should be someone at Microsoft or somewhere else that has one of the
    newer Thinkpads actually running Windows XP 64 or Windows Vista 64 code.

    David Fumento, Oct 27, 2006
  4. David Fumento

    Chris Doré Guest

    I've lost track of Intel's naming scheme (been pretty much ignoring the
    details of Intel for a year or so). Does anyone know of a site that
    summarizes Intel's CPUs?

    Thanks, Chris
    Chris Doré, Oct 27, 2006
  5. David Fumento

    Aaron Kelley Guest

    Aaron Kelley, Oct 27, 2006
  6. Well, if there is, then it's yet another way that Intel is totally
    anti-transparent on 64bit.

    Personally, I'd be quite surprised if it didn't work, but it doesn't,
    ultimately, matter by the time you get to Vista. Vista will use the same
    keys for 32bit and 64bit, and you can run either.

    There _can_ be driver issues, and if Lenova doesn't have 64bit drivers, you
    wouldn't want to bet on it. OTOH, if they have 64bit drivers for that model,
    that pretty much answers it.


    Charlie Russel - MVP, Oct 27, 2006
  7. It turns out that the chipsets will allow execution of 64-bit code: I
    emailed the author of the Business Week article and this is what he wrote
    back. He told me he is going to make a correction (I hate it when
    non-technical people write columns -- as in Mossberg for Wall Street Journal
    as well). The only issue is that we won't be able to address more than 4 GB
    of physical address space until Santa Rosa chipset comes out in the Spring.

    So now is the time to buy a laptop because 64 bit will definately be the way
    of the future. Good news that you can use the same key for 32 bit and 64
    bit, thus enabling people to have dual boot for those apps that don't yet
    run 64.

    You and Intel are both right. There was an editing error in that item that I
    missed; it should have said that the 945 chipset prevents Merom from taking
    full advantage of its 64-bit nature. Specifically, Merom can handle 64-bit
    instructions and has a 64-bit data path. The 945 chipset, however, can only
    handle 32-bit addressing, meaning that the Core 2 Duo/945 pairing is still
    limited to 4 GB of RAM. This will be fixed in Santa Rosa.

    Not long ago, I though the 4 GB ceiling didn't mean much on anything but
    servers but I underestimated the memory appetite of apps, especially for
    image and sound processing. Apple is currently selling 3 GB Macbook Pros and
    will surely go above 4 GB max when Santa Rosa is available.

    Steve Wildstrom Technology & You columnist


    1200 G St NW

    Suite 1100

    Washington, DC 20005

    David Fumento, Oct 27, 2006
  8. Um, try ? Seriously, they're all documented on there, though not
    always in a way that makes quick comparisons easy.
    Steve Foster [SBS MVP], Oct 27, 2006
  9. David Fumento

    Larry Hodges Guest

    I have a new HP dv9000 notebook with a Core 2 Duo T5500. I have x64 on it
    now and it runs great, aside from not having sound.


    Larry Hodges, Oct 28, 2006
  10. David Fumento

    Dennis Pack Guest

    You should have the Conexant audio on you're notebook. PlanetAMD64
    has x64 drivers for this chipset, they work on my Compac v2300cto running
    x64, but I haven't tried Vista x64 on it yet.

    Dennis Pack, Oct 28, 2006
  11. Larry,
    Thanks for the actual confirmation. Glad it runs great. I've reported it
    in . I'm picking up a Thinkpad X60 with C2D when the
    802.11n card comes out in the next week or two.

    David Fumento, Oct 29, 2006
  12. David Fumento

    Chris Doré Guest

    Yes, I could do that. However isn't there always those "geeks" out there
    that love doing summaries and comparisons? :)
    Chris Doré, Oct 30, 2006
  13. David Fumento

    Chris Doré Guest

    Thanks Aaron!. That page, and links from that page, told me pretty much all
    I wanted to know.

    Chris Doré, Oct 30, 2006
  14. David Fumento

    Larry Hodges Guest

    Dennis, I wish I had checked here yesterday. I finally dumped x64 and went
    back to XP. I have to have sound, and I looked for three days for a
    solution. Oh well...thanks anyway. At this point, I'll wait for Vista.


    Larry Hodges, Oct 31, 2006
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