3.1b performance

R9 280x - 350TRT
R9 290  - 250TRT

290 is 1.4 times faster

cgminer

R9 280x - 720Kh/s
R9 290  - 850Kh/s

290 is 1.18 times faster.

Claymore i have plenty more 280xs then 290s. how much faster do you think you can get them 280xs?