If you're looking for a quiet gaming computer you might want to try an open air one.
After decades of messing around with various case types and lots of different intake and exhaust fans I've found the best performing and quietest is by not using a conventional case.
The latest version has only 5 fans, 2 Noctua D15 fans and the EVGA FTW3 1080ti 3 fans. The 8700K cpu is overclocked to 5.3Ghz and the GPU is overclocked to 2012Mhz.
The motherboard, gpu and cpu are actually separated from the PSU and hard drives with long PSU and SATA extension cables .................. with the motherboard, GPU and CPU sitting on a shelf and the PSU & storage drives hidden under a table. The monitor is on a desk about 8' away from the GPU.
That way there is no heat transfer from the PSU or drives to the GPU or CPU.
And, because there is no need to deal with any heat buildup inside a case there are no ventilation fans at all.
By sticking with an simple air cooling, there is no water pump heat & noise or extra cooling fans to deal with.
Conventional thinking is that a case lowers the overall noise because the case itself blocks noise, but what I've found is it actually creates a louder situation because the internal heat builds up that requires more and more fans that all have to work harder and harder to intake and exhaust air.
Not to mention that the GPU and CPU cooling fans have to work harder and are noisier because they are using hot air to start with instead of an open air design where all the components are always using fresh air.
Higher overclocks are possible because everything runs cooler.
Anyway..... just something that might be considered if a quiet gaming computer is what you're looking for.
The only issue is the computer needs to be in a location that isn't going to damaged by little hands sticking toys into it !