No, they don't.
> We did ask about a potential single socket Ryzen/ Zen part with ECC memory support and were told that AMD was not announcing such a product at this time alongside the Ryzen/ Zen launch.
https://www.servethehome.com/amd-ryzen-7-parts-available-for...
https://www.reddit.com/r/Amd/comments/5x4hxu/we_are_amd_crea...
No, they don't.
> We did ask about a potential single socket Ryzen/ Zen part with ECC memory support and were told that AMD was not announcing such a product at this time alongside the Ryzen/ Zen launch.
https://www.servethehome.com/amd-ryzen-7-parts-available-for...