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Intel Corporation Message Board

  • marsavian marsavian May 18, 2011 8:13 AM Flag

    x86 vs RISC ISA power differences

    "The core power cost of x86 over RISC depends on issue width,
    pipeline depth, and in-order vs OOOE. The front end decoder
    complexity goes up with the square of issue width for x86 vs
    roughly linear for RISC. OOOE is also more complex for x86
    than RISC. For something like C2D/Nehalem/SB x86 probably
    adds 25-30% in power over an equivalent RISC. For something
    like Atom it probably adds 15-20% in power over an equivalent

    Now keep in mind for a 1W phone SoC the CPU core accounts
    for 300-400 mW. So x86 adds 45 - 80 mW in full active power
    when EVERYTHING ELSE IS EQUAL. Please note the qualifier.
    It is generally not true. In fact it is so not true that despite all
    its baggage x86 accounts for over 90 cents out of every dollar
    spent in the world on microprocessors of all size, description,
    and use."

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