Just a quick update on my build.
ASROCK board, 3000MHz RAM, no cooler.
Installed my air cooler and have decided to have a play.
Managed to overclock the 3000MHz memory to 3200MHz at 1.35v and not touched the timings. Result!
I have also looked at lowish voltage overclocks, currently settled on 3.7GHz @1.225V, I suspect I'll be able to drop the VCore some more, but am pretty happy so far, when stress testing calculating Pie, temps are just under 60Deg C. I suspect anything after 3.7 will be diminishing returns, but will have an experiment when I get a few hours spare.