IBM's Latest 2.5GHz PPC970FX Info

Discussion in 'General Mac Discussion' started by Sun Baked, Aug 24, 2004.

  1. Sun Baked macrumors G5

    Sun Baked

    Joined:
    May 19, 2002
    #1
    and...
     
  2. Sun Baked thread starter macrumors G5

    Sun Baked

    Joined:
    May 19, 2002
    #2
    As stated by others, looks like he found more cool stuff.

    like this IBM graphic on the 2.5GHz PPC970fx...

    Figure 2. Maximum power envelope from 0.8 to 1.3 V showing the power reduction possible through power-tuning methods.

    [​IMG]

    Figure 3. Maximum power and nap power envelopes showing transitions from maximum power to nap power at f, f/2 and f/4, and then to deep nap at f/64.

    [​IMG]

    ---

    But the compromise in POH reliability the for the 2.5GHz PPC970FX is quite interesting. :eek:

    Plus this chip is "supposed" to be as miserly as the old 1.8GHz PPC970 which had a "typical" of 50W -- and we now see a max here of 100W. ;)
     
  3. alexf macrumors 6502a

    alexf

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    Planet Earth
  4. Sun Baked thread starter macrumors G5

    Sun Baked

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    May 19, 2002
    #4
    POH reliability could be shorthand for MTBF rating of 100,000 Power-on-hours
     
  5. MacinDoc macrumors 68020

    MacinDoc

    Joined:
    Mar 22, 2004
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    The Great White North
    #5
    Didn't I read somewhere that the "typical" heat dissipation of PPC chips as quoted by Apple/IBM is usually about 1/2 of the maximum heat dissipation?
     
  6. Fender2112 macrumors 6502a

    Fender2112

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    Charlotte, NC
    #6
    Anyone care to translate this to Southern Redneck? :D
     
  7. Celeron macrumors 6502a

    Joined:
    Mar 11, 2004
    #7
    Sure thing.

    Current the 970FX processor has the following problems:
    1. It can't run with voltage under 0.8v because of a technical problem in the manufacturing process (0.90nm). The lower the voltage, the lower the power consumption, thus the lower the heat output. This is probably why you won't see a G5 Powerbook for a while.

    2. It can't run reliably at voltages over 1.2. At 1.3v, the voltage required for speeds above 2.5gig, the reliablility of the processor goes down.

    At least thats what I understand all the above mumbojumbo to be talking about.
     

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