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Thread: >THz clock rate possible on purely-serial processor?

  1. #1 >THz clock rate possible on purely-serial processor? 
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    Hi:

    Does there exist any CPU is today's world that possesses ALL the following specs?:

    1. Clock-frequency at or higher than 1,000 THz
    2. Single core
    3. Limited to only 1 instruction per cycle

    In theory, what is the maximum clock rate possible if the cooling system is sufficient? Higher frequencies generate more heat, and thus require more intense cooling.


    Thanks,

    GX


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  3. #2  
    Forum Professor river_rat's Avatar
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    Hi Green Xenon

    To my knowledge, cpu frequencies are limited by three major things:

    1. Switching and drainage time of transistors
    2. Heat generation
    3. Speed of light

    So supposing perfect transistors and zero heat generation we are limited by the time it will take for a signal to propagate from one side of the chip to another. Current CPU die sizes limit that to around 20GHz last time I did the calculation. So there should not be anything running near 1000 THz currently in existence.


    As is often the case with technical subjects we are presented with an unfortunate choice: an explanation that is accurate but incomprehensible, or comprehensible but wrong.
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  4. #3  
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    AFAIK, there are at least two specs in the computer that are measured in Hz. They are the clock-rates of the processor and the FSB.

    Anything else relating to the PC that is measured in Hz?

    One reason I ask is...

    ... I would just like the all the "cycles per seconds" [i.e. Hz] specifications in microprocessing components [such as the CPU, FSB, RAM, etc.] to be the highest possible [given the laws of science] while all specifications involving bits-per-cycle to be only 1-bit-per-cycle. In addition, everything should be centralized and synchronous. Nothing should be peripheral and no signals should be asynchronous.

    What mobo, CPU, FSB, HDD and RAM should I purchase?

    As for the HDD, it should have the maximum RPM [the mechanical equivalent of frequency] with other specs being minimum.
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  5. #4  
    Brassica oleracea Strange's Avatar
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    Quote Originally Posted by Green Xenon View Post
    AFAIK, there are at least two specs in the computer that are measured in Hz. They are the clock-rates of the processor and the FSB.

    Anything else relating to the PC that is measured in Hz?
    There will be different clock frequencies used for internal subsystems of the processor and, possibly, inside peripheral devices.

    ... I would just like the all the "cycles per seconds" [i.e. Hz] specifications in microprocessing components [such as the CPU, FSB, RAM, etc.] to be the highest possible
    Processor performance, and even more so system performance, is not defined by clock speed.

    Nothing should be peripheral
    What does that mean? Peripherals will include all the IO interfaces, memory, storage, etc.

    What mobo, CPU, FSB, HDD and RAM should I purchase?
    Depends what you want to use it for. Read reviews and shop around. For most people it wouldn't make any difference.

    As for the HDD, it should have the maximum RPM [the mechanical equivalent of frequency] with other specs being minimum.
    RPM is fairly standardised and, as with clock frequency, is not the main determinant of performance. This will be affected by things like seek time, cache size, interface type, etc. And also by the HDD controller it is connected to, the performance of the main processor, the type and amount of memory, what the HDD is used for ....
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  6. #5  
    Administrator KALSTER's Avatar
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    Quote Originally Posted by Green Xenon View Post
    AFAIK, there are at least two specs in the computer that are measured in Hz. They are the clock-rates of the processor and the FSB.

    Anything else relating to the PC that is measured in Hz?

    One reason I ask is...

    ... I would just like the all the "cycles per seconds" [i.e. Hz] specifications in microprocessing components [such as the CPU, FSB, RAM, etc.] to be the highest possible [given the laws of science] while all specifications involving bits-per-cycle to be only 1-bit-per-cycle. In addition, everything should be centralized and synchronous. Nothing should be peripheral and no signals should be asynchronous.

    What mobo, CPU, FSB, HDD and RAM should I purchase?

    As for the HDD, it should have the maximum RPM [the mechanical equivalent of frequency] with other specs being minimum.
    How much do you want to spend?

    PS: River Rat! How long since you've last paid us a visit?
    Disclaimer: I do not declare myself to be an expert on ANY subject. If I state something as fact that is obviously wrong, please don't hesitate to correct me. I welcome such corrections in an attempt to be as truthful and accurate as possible.

    "Gullibility kills" - Carl Sagan
    "All people know the same truth. Our lives consist of how we chose to distort it." - Harry Block
    "It is the mark of an educated mind to be able to entertain a thought without accepting it." - Aristotle
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  7. #6  
    Forum Ph.D.
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    Quote Originally Posted by KALSTER View Post
    PS: River Rat! How long since you've last paid us a visit?
    It would be good to have you posting more often!
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