Thanks for the explanations guys. I'm only occasional gamer, what I'm mostly interested in are faster Gradle build times for large projects with Android Studio.
For fast I/O I plan to go with the 970 Pro, for the CPU I'm thinking about the i9 9900K but still not sure whether a Ryzen can offer appr. the same performance at a lower price tag. I will certainly go for an 360mm AIO LCS, so I guess there will be some OC potential regardless of the CPU vendor. Hence my question, I was looking for RAM which will play nicely with an overclocked CPU (G.Skill just because I had really good experience with the TridentX for many years).