But you guys are not understanding and taking it all out of context...
My understanding is, if they do offer a 4gb option along a 8gb one, it will be because the hbm2 will have the ability to use normal ram or ssd as an extension and quickly swap things in and out due to being much much faster than gddr5x.
As long as people are given the 8gb option, I really do not see what the trouble is. There is nothing wrong with having extra options.
Anything involving swapping things in and out is bad as it is time consuming and relies on slower secondary memory.
AMD need to get the appropriate amount of memory on the cards for the task it needs to do and forget about any fancy memory shuffling.