Some more numbers:

16,900 from each R9 290X

14,100 from each R9 280X

11,175 from each 7950

8,950 from each R9 270X

15,450 from each R9 290 when stable, they don't seem to like the miner.  I've noticed the MSI 290s only get 6,250, tried running both the stable and beta drivers. 

4,500 from GTX 550 Ti