have a larger band-gap than silicon. However, these materials and processes are currently (2020) more expensive than silicon.

Managing leakage is more difficult, because before the logic can be turned-off, the data in it must be moved to some type of low-leakage storage.

Some CPUs make use of a special type of flip-flop (to store a bit) that couples a fast, high-leakage storage cell to a slow, large (expensive) low-leakage cell. These two cells have separated power supplies. When the CPU enters a power saving mode (e.g. because

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