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by janwas
1481 days ago
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The CPU has a certain upper bound on power, TDP. That limit is independent of whether it is reached by executing scalar code on lots of cores, or SIMD on a few.
One little-known fact is that out of order CPUs burn lots of energy just on scheduling instructions, ~10x more than the operation itself. SIMD amortizes that per-instruction overhead over multiple data elements, and actually increases the amount of useful work done per joule. We're talking 5-10x increase in energy efficiency. |
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