Spectre has nothing to do with 'Management Engines" and the like. It deals with "speculative execution" (e.g., "branch prediction") that aims at faster executions: https://en.wikipedia.org/wiki/Speculative_execution

The POWER architecture uses speculative pipelines too: https://en.wikichip.org/wiki/ibm/microarchitectures/power9 (see "Speculative" in the info box). I believe researchers only verified Intel/AMD and ARM architectures because they are far more widespread. POWER processors are probably at risk too.

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