Nvidia unveils the GeForce GTX 780 Ti

[boxleitnerb]

Mind explaining the difference and how it relates to the gtx 780 ti?

Sure.
PedantOne said the 780 Ti is GK110-x00-B2.
I asked what B1 was (and A1 for that matter).

If the 780 Ti has indeed 2880 cores, it is not GK110-400-xx but GK110-500 (or 600 or whatever)-xx.
Since the first fully enabled GK110 GPUs entered the market only very recently or are not even released yet (Quadro K6000, Tesla K40), the 780 Ti will most certainly not use different silicon, but the same. Thus there are no previous 2880-core GPUs that could be A1 or B1 in order for a B2 to exist.

Unless the stepping is independent of the number of enabled SMX clusters. But even then, why not B1 for the 780 Ti?

Edit:
tajoh111 is right. 290X pulls more power than Fermi with the uber bios, significantly so:
http://www.3dcenter.org/artikel/laun...9-290x-seite-2
http://www.3dcenter.org/artikel/eine...tromverbrauchs
279W on average for the 290X uber mode
235W on average for the 480
Both values are averages of multiple measurements that measured only the card itself, so it doesn't get more accurate than that.

• The 290X is late just like Fermi was.
• It is hot and loud just like Fermi was.
• It doesn't beat the competition at even ground across the board (quiet bios vs Titan stock or uber bios vs Titan@maximized targets) just like Fermi did. In 4K it wins slightly by under 10% but loses in 1080p or with SGSSAA:
  http://ht4u.net/reviews/2013/amd_rad...ew/index46.php
  https://www.computerbase.de/artikel/...90x-im-test/5/
• It uses more power than the competition in either comparison (see above), the same or more than Fermi depending on the bios mode.

Now the positives:
The 290X's perf/W doesn't fall as far from Titan's compared to GTX 480 vs 5870.
The GPU is smaller, great feat of engineering
Price