Overall, Skylake is not an earth shattering leap in performance. In our IPC testing, with CPUs at 3 GHz, we saw a 5.7% increase in performance over a Haswell processor at the same clockspeed and ~ 25% gains over Sandy Bridge. That 5.7% value masks the fact that between Haswell and Skylake, we have Broadwell, marking a 5.7% increase for a two generation gap.
That was before all the Spectre and Meltdown stuff, which had much harsher penalties on generations older than Haswell if I recall correctly. Note that modern Windows versions should update the Microcode on their own, so using an old BIOS version won't save you from the mitigations performance penalty.
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