Re: AMD64-based laptops from HP/Compaq are crippled

From: Robert Klute (news_at_klute.us)
Date: 07/05/05

  • Next message: Robert Klute: "Re: AMD64-based laptops from HP/Compaq are crippled" 
    Date: Tue, 05 Jul 2005 07:31:47 GMT

    On Tue, 05 Jul 2005 06:55:04 GMT, Robert Klute <news@klute.us> wrote:

    >On Mon, 04 Jul 2005 23:19:07 -0700, alex goldman <hello@spamm.er> wrote:
    >
    >>Robert Klute wrote:
    >>
    >>> On Mon, 04 Jul 2005 20:46:58 -0700, alex goldman <hello@spamm.er> wrote:
    >>>
    >>>>I've been researching my next laptop purchase, and whether it will run
    >>>>Linux, and completely accidentally stumbled upon an alarming issue that
    >>>>people need to be more aware about.
    >>>>
    >>>>Apparently (and if my understanding is correct), HP/Compaq disables
    >>>>dual-channel memory access in Socket 939 motherboards, making CPU <-> RAM
    >>>>communication slower, and overall performance less than what people would
    >>>>expect when buying a system with the outward characteristics of what they
    >>>>think they are getting.
    >>>>
    >>>>http://zv6000forums.com/viewtopic.php?t=148
    >>>
    >>> The laptops use the Turion chip.
    >>
    >>Wrong. _Some_ of the laptops use the Turion chip (quite few as of this
    >>writing, actually).
    >
    >The zv6000, the laptop under discussion here and in the forum you
    >referenced, uses the Turion chip.
    >
    >>Regardless ...
    >>
    >>> According to AMD, the Turion's
    >>> integrated memory controller can use PC1600, PC2100, PC2700 or PC3200
    >>> unbuffered DDR SO-DIMMs and has a maximum throughput of 3.2 GB/s.
    >>
    >>Do you understand how dual-channel access works? You have 3.2 GB/s per
    >>memory module, i.e. up to 6.4 GB/s. Dual-channel access is more, not less,
    >>important when slow memory is used.
    >
    >NO, the Turion's memory controller is 64-bit and limited to a max of
    >3.2GB/s. Dual channel won't help. Read the specs. Here is the
    >executive's graphic for you:
    >http://www.amd.com/us-en/Processors/ProductInformation/0,,30_118_12651_12663,00.html

    And just to be absolutely clear, only the chips with 128-bit memory
    controllers can use dual channel memory and ALL the mobile AMD-64 chips
    are listed as being socket 754 and having 64bit memory controllers.

    http://www.amd.com/us-en/Processors/ProductInformation/0,,30_118_10220_10221^11030,00.html

    As for the forum thread you referenced, the posters are just a bunch of
    whiny idiots. Since only an idiot would think that a laptop would use
    an 89W 939 chip in it. Talk about a hot system, it would have to come
    with a nomex pad to keep you from getting 2nd degree burns.

  • Next message: Robert Klute: "Re: AMD64-based laptops from HP/Compaq are crippled"

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