Update to my partial answer:
Haven't loaded windows yet, but was able to get linux connected up sufficiently to run some interesting tests (significant load).
TridentZ 3400 32G running at 3333MHz without issue under heavy load. The reason for 3333 vs 3400 is that I haven't yet debugged why the on-board GPU is completely intolerant of any setup that isn't BCLK=100 and 1150MHz. So, until we figure that one out, I am limited to BCLK=100 rather than XMP's 10x.x that brings you to 3403MHz.
The GPU issue is that under or overclocked, it does not matter, any BCLK!=100 gives digital noise and random blanking and eventual disconnect over both DIsplayPort and HDMI2.0.
p.s. FWIW, from stock to 3333 without changing the 4.2GHz CPU/Cache speed, I saw a ~15% bump in performance of a large memory, multi-core application that is CPU/Memory bound not disk/network/io. Perhaps more notably, at stock memory speeds it was performing identically to my 4970k and 5930k (@ 4.6GHz and 4.4GHz respectively)on the same number of cores (4).
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