Just now on the twitch stream, already mods and people chatting, one of the mods Sgt_Bilko88 seems to be hinting that the 390x isn't the same core, and when they retorted, he said have the official specs been released?

or something like that when someone said 'the specs are exactly the same'. Does he know something we don't?
EDIT: Here's a copied trascript of what i saw
Sgt_Bilko88:
@thewhitestigvk, Do you know that for a fact?

NOTE: ---- I don't know what the other guy said before this.
thewhitestigvk: Sgt_Bilko88 It is the same core.
Sgt_Bilko88:
@thewhitestigvk, It's not the same core
thewhitestigvk: Sgt_Bilko88 It has the exact same specs.
Sgt_Bilko88:
@thewhitestigvk, Has the official specs been released?
thewhitestigvk: Sgt_Bilko88 This is like saying that the Antigua is not Tonga
thewhitestigvk: or that Grenada is not Hawaii
Sgt_Bilko88:
@thewhitestigvk, Not it's not, this is about a different card, until the annoucement has been made by AMD the rest are all rumours
thewhitestigvk: Sgt_Bilko88, okay, we'll wait another hour, be we all know what it'll be
Just thought it was of interest.
EDIT:
The wink here is filling me with confidence, although perhaps that is their job
Sgt_Bilko88: @NOLVENTILE, HBM is a lot faster than GDDR5, so we'll see what happens but i don't think 4GB will be as big of a limitation as people seem to think
