AMD Sempron on older Socket A system with PC133 SDRAM?

Discussion in 'DIY Computers' started by Andrew Oakley, Jul 18, 2005.

  1. Hi, I wish to upgrade my parents' (how sad does that sound? I'm 33!)
    Compaq PC which has an AMD Athlon 1GHz and 128MB of PC133 SDRAM.

    The motherboard only takes SDRAM, not DDR.

    Will this be compatible with a new AMD Sempron 3000 Socket A?

    The reason I ask is because the Sempron is usually rated at 333MHz
    FSB. With the mobo only taking SDRAM, I assume the FSB is nowhere near

    I will be installing a further 512MB of SDRAM at the same time (or
    rather, immediately after it successfully boots with the new CPU).

    Many thanks,
    Andrew Oakley, Jul 18, 2005
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  2. Andrew Oakley

    Cuzman Guest

    Andrew Oakley wrote:

    " Will this be compatible with a new AMD Sempron 3000 Socket A? "

    No SDRAM motherboard will fully support a 333FSB Sempron, and most of
    them won't even boot with it in.

    The Athlon 1GHz Thunderbird came in 100FSB and 133FSB models (Athlon 'B'
    and Athlon 'C' respectively). Even though your system has PC133 SDRAM,
    the CPU may still be 100FSB. Many socket A chipsets of that age ran
    PC133 whilst only supporting 100FSB CPUs.

    Find out what motherboard it is using Everest Home Edition. . It could
    well be a Compaq-licensed proprietary motherboard, of which Everest may
    give sparse details for.

    If it only supports 100FSB CPUs, then you can only upgrade it to a
    100FSB Athlon 1.4GHz Thunderbird. You'd have to pay £40 for one of
    those on eBay, so it simply wouldn't be worth it.

    If it supports 266FSB CPUs, then it might not necessarily support the
    full range of 266FSB Athlon XPs. Usually you can look up the CPU
    support list on a motherboard manufacturer's website, but I doubt Compaq
    give that service for proprietary motherboards.

    If it supports 266FSB CPUs, and you manage to find out the highest
    266FSB Athlon XP that it supports, you're probably going to have to get
    it from eBay.

    Also, you may find that the motherboard can't accept high-density RAM
    modules. I've had early PC133 socket A motherboards that wouldn't
    support more than 512MB in total, and they wouldn't take a single 512MB
    module either.
    Cuzman, Jul 18, 2005
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  3. Thanks for the replies. I have now decided to buy an Athlon XP instead
    of a Sempron, and have readied myself for the possibility that the
    motherboard may only support speeds up to 1400 or similar.
    Andrew Oakley, Jul 19, 2005
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