Well 4890 if you look at the specs, don't show tooo much gain...
Now 275 GTX is priced to go for 249.99$ and I've seen the 4890 is going to go for 299$. So its still going to be 50$ cheaper than the 4890.
The 4890 looks basically almost the same scenario as 260 GTX vs 260 GTX sp 216 to me
Although the gains look to be greater than what the SP 216 brought to the table.
Althogh I think they should've waited it out a bit and seen what the 4890 brought to the table....sooo meh!
Frankly I don't care which wins haha, I just care about the new series, both of these go into my revision pile