I'm running a GTX 2080 with a Xeon 5650 on water. 4.4ghz 24/7. I game in 4k for the most part and I can say that there is no bottleneck. In fact most games consume ~20% of all cores under load (far cry 5 max settings). Which other games are you curious about, I'll try them.
More evidence that I'll be keeping my existing setup for the foreseeable future. I think this must be a record for the longest usable motherboard I have ever had.