I didn't want to buy an X3D CPU just after release, but somehow I decided to get a 7800X3D earlier this month. This CPU is something weird (in a good way, I guess), and this is why:
1. No matter what cooler I used, it boosted up to 5040MHz at 75-91% of temp limit (which in theory is 85°C with max temp limit of 89°C). Similar noise (auto fan speed), the same performance, no throttling, etc. I compared Deepcool AN600, Assassin IV, and Noctua NH-U12A with offset mount.
2. TDP is 120W. At stock or with enabled PBO, software reports 80W, all cores boost up to 5040MHz. Sadly I have no motherboard with a separate PCIe clock adjustment, so I can't overclock it.
3. No matter what RAM I used, I could make +/- 2GB/s memory read/copy and +/- 10GB/s memory write (which isn't important) and +/- 5ns latency. In short, the average was 62/95/62GB/s and 65ns. I compared 2x48GB Microns @6000 CL36 (it's literally the slowest RAM on the market.. but I overclocked it), 2x24GB Hynix @6400 CL32, and 2x24GB Hynix @8000 CL36. Microns at 5600 EXPO CL44 were barely worse in bandwidth but had 90ns latency.
It's literally like:
$150 motherboard vs $500+ = no difference
$40 cooler vs $150 = no difference
$100 RAM vs $500 = no difference
Test results and gaming benchmarks were +/- the same on all setups (exclude Microns at EXPO 5600 as it was slower).
In short. If you want a gaming CPU that runs cool and quiet, performs great, and can save money on the motherboard, cooler, and RAM, then there is no better option.