Hi, I have a 2010 2.8 mac pro quad with only firewire 800 9 pin ports. I have a 6 pin firewire device that "cannot be" bus powered and has its own ac adaptor. I was wondering when hooking up these to with a 9 to 6 pin firewire cable, if firewire bus power will still be sent to the device? Or is there something built into the firewire protocol where it will "determine" and not send bus power to devices that don't require it and have there own power source? I am concerned about the extra bus power, because I know issues of unnecessary rises in cpu temps and noisier fans and potential damage to firewire devices.