Workstation: 2700
Only a select few games are able to use more than 6 cores, and then only in some situations. For compilation and other workstation tasks the 8-cores (and more) are king, but they're expensive, so unless you have money to blow, go for the 2700.
Poorly designed older games. Modern games should be able to use all cores, because Vulkan is available. Something like dxvk for example is using as many cores as reasonable for compiling Vulkan pipelines.
See its config Wiki (dxvk.numCompilerThreads parameter) : https://github.com/doitsujin/dxvk/wiki/Configuration
So more cores can help for gaming, no doubt. Just depends on the use case.
Funny, its not many years ago people said games can use just 1 core, then 2 cores, 4... and now 6. Isn't it likely this progression will continue?
Work-stealing queue design in games can use as many cores as you can throw at it (at least until memory bottleneck).
And what is with the diff between 2600 and non x? I think I need an aftermarket cooler for both variants .. and the 2600 (non x) are cheaper in Power consumption and the clock losses are acceptable, or not?
And a b450 Mainboard will also be good enough? Im using a Nvidia 1060 6gb graphic Card.