Advanced Micro Devices Inc (AMD)

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Re: wouldn't leakage be a function of how much power is running through the chip (and maybe other variables as well)?

Leakage would be a function of voltage, as well as the design of the circuits being used. Processes will have choices for transistors, with high performance versions going in critical locations and low power ones in non-critical locations. Everything else being equal, however, you should be able to get 2x more leakage with 2x as many transistors.