The CPU is fine IMO and unless your sys isn’t seeing the memory or it’s some ungodly slow memory, then that mobo has to be the issue, Especially if as you said there was info that came out later about a problem of any kind.
Fortunately thats the cheapest upgrade. Even an older z87 (which I have) will pass that much data with no problem.
I’ll start looking into them. I may want the next generation Intel socket, though, which will ramp up the cost pretty quickly! But, as you say, I could throw in a relatively cheap mobo that works with my current processor and see if I’m back on track. I could then think about a bigger upgrade later. Thanks.