I think you are both right - sometimes Willy's missives are not crystal clear!
For sure, ATi is targeting GPU clock speeds beyond 1GHz but not, I'd imagine, 2GHz in the near future.
So it's most likely RAM clock speed that's approaching or already at 2GHz.
With our Willy's permission, I'll try to make this clearer in the original and in any related threads or front-pagers - but think it best I do nothing right now until I get another of those electrionic emaily messages from his self clarifying the situation.