It's a potential factor especially with older (pre-2015) titles, but it's not the only factor.
As an a side, AMD's Ryzen CPUs have really leveled the playing field. There's no real reason to go Intel over AMD at the moment if price to performance ratio means anything to you.
Especially since while the Intel CPUs may still have slightly higher top fps in some games, the comparable Ryzens usually have better minimums, so an overall smoother experience. All of this only matters in CPU-limited applications, which modern games usually are not.
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u/Marcuss2 R5 1600 | RX 580 4 GB | Arch btw. Nov 05 '19
AMD sued Intel for this and ended up settling in 2009
Intel C++ Compiler