Hm...  Rig with only one 7950 working well 2 days. Rig with 4 x R9 270x toxic (default setting) hangs on mining window, not hashing.Random time from 1 to 5-7minutes... restart again & again,allways same result. Miner v1.1  .  Now with CDM v4.4 rig working fine 5 & more days uptime.
P.S.: sorry for my bad english.