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I was making some benchmarks in preparation for new CPU releases to have a point of comparison for later and decided to do some 6900K stock vs OC numbers while I am at it. I've picked some of the most CPU problematic games that I have ever encountered and added two "normal" ones as well. Full list of games, specs and settings below.

6900K - 3.5 GHz all core, 2.8 GHz cache, 4x8 DDR4-2400 18-18-18-36-438-2T, not tuned
6900K OC - 4.5/4.4 GHz core, 3.4 GHz cache, 4x8 DDR4-3400 13-13-13-39-289-1T, tuned

Lord of the Rings Online, 3840x1600, Max Settings, MSAA Off, Blood of the Black Serpent
The Witcher - 3840x1600, Max Settings, MSAAx4, Trade Quarter
The Witcher 2 - 1920x800, Max Settings, Ubersampling On, Foltest's Camp
The Witcher 3 - 1920x800, Max Settings, Hairworks Off, Novigrad
AC Origins - 1920x800, Max Settings, Alexandria
CS:GO - 1920x800, Lowest Settings, FPS Benchmark Map

LOTRO is an extremely CPU bound MMO with some of the most disastrous performance you can find in any game.
The Witcher is DX9 single-threaded game that is having huge performance problems in dense areas.
The Witcher 2 is also DX9 single-threaded, and enabling Ubersampling walks back on deferred rendering, which removes all the artifacts and aliasing caused by it, but also doubles both CPU and GPU requirements.
The Witcher 3 is added as an example of well optimized modern multi-threaded game.
AC Origins is an example of broken and unoptimized game despite being modern and multithreaded. This applies to almost all modern Ubisoft titles.
CS:GO is commonly used benchmark that anyone can run for free, so it is a good point of comparison.

This is a really tough selection that includes some of the most CPU problematic games I've ever seen, I will run that again on a new CPU, whatever it ends up being, and compare to 6900K.

For 6900K, overclocking resulted in 36% gain on average and up to 48% for 1% lows.

LG 38UC99-W 85 Hz
MSi RTX 2080 Ti Sea Hawk X
i7 6900K 4.5 GHz
Asus X99 Sabretooth
4x8 GB DDR4-3400 13-13-13-39
ADATA XPG SX8200 PRO SSD
Win10 19044