Since people are asking about the performance impact of the #Meltdown mitigations for Dolphin: go update your OS instead of being concerned about your framerate.
(But if for some reason you really care: most likely none, especially on Ivy Bridge and higher. No impact on AMD.)
Pretty sure PCID is 3rd gen onwards -- I've had multiple reports of Ivy Bridge users that see PCID in their cpuinfo (and no contradictory reports). That's why I mentioned Ivy and not Haswell in that earlier tweet.
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