Generally how much does performance improves each generation?

[fasty1]

Lets say you are going from a 6870 to a 7870 or a 7870 to a 8870. With data gathered from previous generations how much more in term of performance do you get with each generation of GPU family?

 

[Sumukh_Bhagat]

Well, you can't tell until 8870 arrive.
But the difference between 6870 ans 7870 is way too much. Its around double.

 

[prototype18]

http://www.techspot.com/review/603-best-graphics-cards/page4.html

Well check this out. There is another new review but this tells you all. 7870 can OC more than 6870 (low headroom). It gives increased performance in games /less heat/power draw.

And dont even mention Ghz edition that kills that 6870 .

 

[bigcyco1]

Have a look http://www.anandtech.com/bench/Product/540?vs=548&