> OC'ing ECC is generally a terrible idea, if that's what you're doing.

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.