vega 20 ? could this be a polaris replacement on the low mid ?

Vega 20 is for AI and Deep Learning.

Fox2232:

I'll shoot: Vega is named based on number of CUs, so this is likely Vega with 20 CUs. So it is something like GPUs made for intel.

by Vega 10 and 11, Vega64 has 11 CUs? dunno,

-Tj-:

by Vega 10 and 11, Vega64 has 11 CUs? dunno,

You're actually right. While windows driver does not use Vega 10/11/... wording, Linux Vega10 has device ID 0x687F and that's Vega 64. AMD could have thought better naming scheme for Vega, not to give code-name used for one as name to another.