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From: Alexey Borisenkov <grizlik78@gmail.com>
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Date: Wed, 10 Jan 2018 20:00:03 +0400
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Subject: Re: [Comm]
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Ну или вот так более надёжно:
$ /usr/sbin/iucode_tool -s 0x000306a9,0x10 -l /lib/firmware/intel-ucode/
microcode bundle 1: /lib/firmware/intel-ucode/intel-microcode.bin
selected microcodes:
   001/173: sig 0x000306a9, pf_mask 0x12, 2015-02-26, rev 0x001c, size 12288

То есть по указанной сигнатуре выбирается ревизия 0x1с, которая уже в 
процессоре.