Rock solid on all versions (10.0-11.4), my cards are hard moded (bios mods). But the 11.2-11.4 versions increased not only my hashrate but also power constumption as well, where my hashrate increased from 238mh/s to 241mh/s and power drawn for the rig in dual mining mode, from 1500W to 1620W. As I am not going to go through all the trouble with the cards all over again I appreciate the path Claymore is taking.