*** PRELIMINARY IMPRESSION ***
If Ryzen 3rd gen is inferior in high refresh rate (144Hz) 1440p gaming I'm not seeing it yet versus my i7-8700K OC. I will need to do a scientific analysis with framerates+frametimes when the BIOS is mature enough for me to try a max to max comparison. Keep in mind on benchmarks my 3900X is matching the 8700K OC in ST performance. You can
maybe squeeze another few % out of a better 9900K chip.
I've only played PUBG, Rainbow Six: Siege, and CS GO for e-sports titles so far. Reviews showed those to be as good or better on the 3900X and my experience so far bears that out. In particular on PUBG I am actually noticing an improvement in FPS and minimum FPS. I don't know why this is, but I speculate it's either related to the large cache or the better memory bandwidth on my 3733 CL16 1:1 IF setup versus the 3600 CL15 I was running on my 8700K OC. I need to try >4000 MT/s memclk with a divider to see if it scales further...
The only review I can find for PUBG performance @ 1440p was on 4gamer (JP site) which showed the following. They used 3600 CL16 XMP for both Ryzen 3000 and 9900K:
I do have to wonder if the massive L3 cache makes a difference at 1440p... Replay files mean I should be able to do some proper A/B performance comparisons eventually
As for 4K, there is definitely no discernible difference when I game at 4K60 for single-player games. That's completely GPU bound so the result is in line with expectations. I prefer my XG270HU @ 144Hz for multiplayer shooters, but that's about it as it's inferior in terms of colors, contrast, and immersion to my 4K setup.
The one thing I have definitely noticed is the heat (and by proxy, noise) production is less while gaming. The BIOS is definitely immature, because I've improved my performance by explicitly disabling PBO and undervolting the CPU. Doesn't make any sense, but I'm getting better than stock/review #s with my setup while pulling less power. Weird...
tl;dr:
It seems like at least for the games I play with my crew I am getting equal or better performance while getting a massive upgrade in performance for actual work. This is my preliminary impression with very immature BIOS. I'll wait for BIOS fixes to revisit with a proper A/B comparison with benchmark #s.