Hasn't Nvidia already said Q1 for the 600 series?
I have not read or seen anything that shows the hd7970 Tahiti GPU to have any parts of it disabled. Also look back at my previous comment I edited it and asked you question regarding Kepler.
You read it here first. Is it not logical that AMD would take a page from their old playbook?
And it will also be in MY own preview tonight. i just have to formulate it better there than i do here.
-- i have heard this from my own sources; it is not confirmed and probably won't be until the refresh in a few months.
And i don't "know" what Nvidia will do other than by their history
- if AMD launches their flagship card, Nvidia will respond with a faster one (if possible)
Nvidia will not meet AMD with their midrange. Unless the GTX 660 Ti is faster than the HD 7970, and then maybe they would do it as a "first" just to embarrass their competitor. (i would in that case, only)