Why is register renaming considered the most expensive part of a modern core?

Popularity Index: 8 Updated at 2026-10-11 07:28 UTC

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How much does branch prediction accuracy actually buy in real IPC? What caps clock frequency harder: pipeline depth or wire delay? How do heterogeneous cores decide when to migrate a running thread? Does a smaller instruction set really cut decode power? Why does out-of-order execution need a reorder buffer at all? What does widening a core from 4-wide to 8-wide decode cost in area and power? Why does a chip that wins benchmarks sometimes lose in real products? What does running an old dual-socket server at home add to the electricity bill? Why do speculative execution mitigations keep costing performance? What workloads still justify a general-purpose CPU over a dedicated accelerator?

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