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RAM _capacity_ has a direct effect on energy, usage not nearly much if at all.

Hardware has been around to selectively put banks into low power saving mode, but I've never heard of any commodity OS that supported anything like that. It'd require active organization of physical pages to take advantage of, if common controllers even supported it

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Note that most of RAM's power consumption comes from reading and writing (a function of memory clock speed). Allocating the RAM itself is likely to meaningfully increase power draw, but accessing it will.

Are there any benchmarks around showing this? And how much extra power draw it is.

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