Frontside Bus Speeds

Discussion in 'Macintosh Computers' started by Hoopsup07, Dec 14, 2003.

  1. Hoopsup07 macrumors newbie

    Aug 21, 2003
    The 1.6GHz G5 had 800MHz bus, the Dual 1.8 has a 900 MHz bus, the Dual 2.0 GHz has a 1GHz bus. The bus speed times two (1GHz x 2) = 2GHZ the speed of the machine. So if this stays the same, the Dual 3.0GHZ would have a 1.5GHz bus, wouldn't it? The 2.4GHz would have a 1.2GHz bus and so on... Does this make sense?
  2. robbieduncan Moderator emeritus


    Jul 24, 2002
    If the bus speed remains set at 2x multiplier then the 3Ghz G5 will have a 1.5 Ghz FSB (actually a twin 1.5 Ghz bus assuming that it is launched in a twin processor machine, 1 bus per processor).

    But the FSB mutiplier does not have to remain at 2x. IBM have stated that the mutiplier can be set to other things so the FSB may not have to scale at the same rate as the clock speed. 2x is amazingly low (look at the 10x multipliers seen on some fairly recent PCs). It is possible that the 3Ghz machines will launch on a 3x multiplier leaving the FSB at 1Ghz. Without RAM speed ramping up moving the FSB up much further is probably not going to do much.
  3. Dont Hurt Me macrumors 603

    Dont Hurt Me

    Dec 21, 2002
    Yahooville S.C.
    I think the bus speed will hold pretty steady for awhile i mean after all its been increased almost 10 fold compared to( excuse why i gag ) Motorola. I think what will determine the bus on newer machines will be costs & the limit on current technology. I have to say after getting to see a new G5 the other day that it is a very impressive machine. I almost cant imagine a bus of 1.5 ghz! awesome. its so so nice to see Apple making Great progress again.

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