I also use version 31f, but for another reason. All versions after do not restore the maximum speed in case of disconnect on my rig from 12 550. Versions after 31f do not always have time to give the cards to the maximum speed in the allotted time. On version 31f some cards go to the best mode only for 30 minutes, but they do it! I'm writing this about the fast algorithm. http://prntscr.com/knwz2e