Can someone give a config for 290non-x?

-I 19 --gpu-engine 947 --gpu-memclock 1250 -g 2 -w 128 --thread-concurrency 20481
Gets me 3550 KH/s on R9 290 (non-X).
Does anybody have some better settings? My card doesn't seem to like -g 4 and if I push the engine too high I get driver crashes.