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IBM Broadway CPU; additional execution units over Gekko ?

Discussion in 'Embedded' started by AirRaid1500, Sep 10, 2006.

  1. AirRaid1500

    AirRaid1500 Guest


    "Video of Broadway manufacturing reveals hint of Broadway die

    Someone on IGN boards found a video of Broadway being manufactured by

    Link to the thread

    Link to the video on IBM servers

    On 0:10 we can see a wafer. It looks like it has 8 blocks with 7 CPUs
    each, so that would be 56 CPUs in one line. The CPUs look square. If we
    assume this is an 300mm wafer (anything else seems unlikely), then
    Broadways die is about 5mm x 5mm = 25 mm^2. (300mm/56 = 5.36mm)

    The Gekko die is 43 mm^2 but manufactured with a 180nm process. If you
    would manufacture that design at 90nm like the Broadway it should be
    about 11mm^2. So if the Broadway is really 25mm^2 it should offer quite
    a bit of additional power over Gekko, not just a higher clockspeed.
    512kb L2 cache instead of 256kb cache in the Gecko is pretty much a
    given imho. IIRC the L2 cache uses under 50% of the Gekko die, so even
    with 512kb cache we would still be around 15mm^2. So there is still
    room for stuff that adds more performance like additional execution
    units or splitting the Gekko pipeline into more steps to reach a even
    higher clockspeed than would you would be able to get from the shrink

    After looking at this evidence it seems pretty likely that Broadway is
    quite a bit more than just a overclocked Gekko."

    Well that makes sense to me. Gekko, from what I understand, is a
    modified IBM G3 CPU, basicly 1997-level technology, tweaked in
    1999-2000 for release in a game console in 2001 at 485 MHz.

    I would *hope* that Broadway is signifcantly more powerful than just a
    ~729 MHz Gekko.
    AirRaid1500, Sep 10, 2006
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