My 7950X is like 5.4GHz 1.25V CCD0, and 5.3GHz 1.25V CCD1 or 5.4GHz 1.28V CCD1. Long high load passes only at 5.3GHz when all cores are set to the same frequency (at 5.4GHz it's or too hot or I see bluescreens). Full load at 1.25V = ~99-97°C on 360 AIO (ASUS or Deepcool AIOs).
I noticed that CPU voltages are slightly different on various motherboards. On Gigabyte my CPU needed slightly lower voltages, like 1.22V, while on ASUS about 1.25V to make the same clock.
Now check other reviews around the web and you see that in most of them, 5.2GHz is assumed as good OC at all cores set manually. 5.15-5.20GHz is about average that my CPU does at auto settings under full load what is much above the base frequency. As far as my CPU isn't any special, then looking at average results in reviews around the web, it still looks above average.
Btw. idle temps are close to 50°C with 360 AIOs. Mixed-load temps (something like PCMark 10 benchmark) are 95°C as at least one of the cores is bumping to the power/thermal limit. Max load is also 95°C, but at slightly lower frequencies if set at auto. All that looks weird but this is how these CPUs work at auto clock/voltage adjustments and with given power/thermal limits. I still feel it's a huge step forward looking at the last gen CPUs.