Has anyone found a reliable bios mod for the Sapphire rx 480 8g cards that reduces power but keeps the h/s rate respectable?  Most of what I have found on forums have been unstable.  I have 4 rigs with 6x Sapphire 8g 480's that each run at around 1200w (and I have a 1300w psu) and 11.5A  and deliver 260 H/s on each card with the stock bios and I am having to reduce their intensity each time the mining software speeds the mining up or the whole platform shuts down due to exceeding power limits.  I have played with different power tools such as Watttool (Wattman is useless for multiple cards and settings in Claymore just freeze my systems) but I am a bit of an inexperienced computer user so I am not sure what to try and I don't want to damage my systems.  I have read every page of this forum as I have worked through all the same issues with Open CL and cards not being recognized, and I appreciate the degree this forum supplies ideas and methods to help others work through their issues.  So I am asking my first question around suggested settings in Watt tool or perhaps even a stable and capable bios mod that keeps power down while not giving up on the current performance, if possible.  Any help is appreciated.