How so? For example I can see when the higher summer temperatures becomes an issue and reduce my timings, then tighten them again as it gets colder. No more random crashes where I wonder if it's my RAM or something else.
Currently doing 3333MT/s CL14 on 4x16GB of 2666MT/s ECC. I use CL16 in the summer. Since the memory sticks barely are affected by the heat, and that ECC errors occur on the same slot of the motherboard regardless of which stick is in there, I assume its the memory controller on the CPU in combination with four sticks of memory that's the limiting factor here.
I mostly just did that test to check if I'd have to give up the 3600 speed if I'd upgrade from 64GB 128GB on this 5950X; I'm well aware that one shouldn't be running it single-channel, especially not if that would mean quad-rank operation.
I do question though how OC'ing non-ECC is a better idea than OC'ing ECC. Also, just for the record, I based my timings off of an XMP profile for a non-ECC version of the same die/capacity configuration (32G 2Rx8 w/ Micron Rev.E 16Gbit).
I also haven't seen 32G sticks that do better than CL22 at 3200 with just 1.2V.