Getting 11MH/s on ETH with 5700 XT, on older version like 0.7.22 i got 50mh/s. Haven't changed anything.
If you have the gpu connected to a monitor, add argument --eth_big_mode_adjust=1024. It's a resolution issue and the miner can overallocate VRAM unless you add this argument. Will be addressed in a future release.