So in general boards such as the Prime Pro is only a 'cheaper' board in terms of Ryzen?
I say that because ram speed on the Prime Pro x370 seems to be the big difference when compared to say a CH6.
Because other than more overclocking features the Prime Z370 supports the same ram speeds etc as say a premium Z370 board?
It's always been the same with any generation of mobo's. The top boards have better VRM's, better power control, more accurate power control, and as a rule a better bios. I can remember very vividly an Abit mobo i had in the early 2000's that did a great job of clocking an Athlon 1700. Problem was though it was rubbish with the ram. DFI came along and blew Abit straight out of the water with a mobo that could clock the same chip higher and left Abit's ram speed standing still.
If you really love clocking ram and cpu's, then you just have to go for the best mobo available. You can't buy a cheap mobo and expect it to produce the same results as the best. It's like buying a BMW 535 and expecting it to be as quick as the cheapest Ferrari.