Also, I have the Corsair memory that is supposed to be good for 3200mhz, and it won't boot at all at that speed.
My GB Gaming 5 board will boot using that RAM@3200, but it isn't stable under multi-threaded load (Prime95 and/or my NLE). It's only stable at 2133 for me right now. Not entirely happy about that -- the RAM is on their list (well, the 64GX4M8, which is just the 8 stick variety).
CPU overclocked easily to 4Ghz with a voltage setting of 1.375 (I didn't try a lower voltage, and I haven't run it on a multi-hour soak yet, but I'm also on air, not water). 4.1Ghz was a fail at 1.4.
Looking into the threading details of my NLE, looks like it suffers from some kind of latency issue that prevents it from running its main threads at 100%. As a result, it requires high-slice encodings so that it runs enough threads to keep up to date. Unclear where that bottleneck is. That said, there's enough single-threadedness in various parts of a number of NLEs that unless the threadripper gets a serious frequency bump, I'm sticking with the 8-core for now. Running twice the cores at 2/3 of the speed is not appealing for my use case. It'll be interesting to see where Skylake-X frequencies land as well.