The dual core i5 and i3 'T' CPUs work with ECC RAM and some of the earliest Gen8s were supplied with the i3-3220T. For some reason Intel changed the description of these CPUs to remove ECC compatibility but that doesn't change the physical chips. The i3-3220T, i3-3240T & i5-3470T all work with ECC RAM but the i5-3570T doesn't (it's 4-core). I know 'cos I've tried all of them in a Gen8.
If you want a 3470T put something in the Wanted section of the MM.