forget the b7 and try the new experimental (read: very untested) B-sync GPU
That's the lone .exe in the github page.

1. Stable and fast hashrate
2. new parameter --no-monitor to disable fan/temp monitoring (the purple report)
3. various optims for some cards and some algos, expect about +0.5%
4. Fees still 0.9%

so far it burns like fire on my rigs, i hope it really fixes all the hashrate and warmup problems.