Perhaps this is a dumb question. If so, don't hesitate to tell me.
Some days ago there was an article on the BC site entitled "Microsoft Releases Two New Windows Updates Containing New Spectre 2 Mitigations". These were manual-only Windows 10 updates for the CVE-2017-5715 (Spectre v.2) vulnerability: KB4078407 (software only) and KB4091666 for Intel processors only, including a firmware update. My possibly stupid question is, are these only for situations in which no OEM firmware update has been made available? I have two Dell computers, one desktop and one laptop. Both have Intel processors. To the best of my understanding I have installed the appropriate software mitigations as they became available, and Dell has made a firmware update available for each of these machines, which I have also duly installed.
So am I correct in thinking that these two new manual-only updates from Microsoft are not necessary, and might even be inappropriate or harmful for these machines? I'd prefer to think that "If it ain't broke, don't fix it!" applies here.
Steve Gibson's "InSpectre" program, Release #8, reports "yes" to all 3 questions (Meltdown protected, Spectre protected, and firmware update available) and "Good" performance.