Hey some 290 settings, this will give 62khash at 977core :
--scrypt-jane --sj-nfmin 4 --sj-nfmax 30 --sj-time 1388361600 -I 16 -g 1 -w 64 --thread-concurrency 85000 --lookup-gap 3
This is better than going 90000 TC with lookup-gap 4. Itensity of 17 and higher slows the system by a huge amount(at least for me). There may be room for improvement but I have already achieved 280x/290 ratio of 0.81. I have 8gb of ram + 16gb of pagefile(set as a constant).
If helped

: UmC3d5BemAaKDhEwpiGo2EQuyYMvWDpS1r
thx! how many GPU's you have? I have 4 x 290 and the first gpu is disabled/OFF. enqueing kernel blah error.