I am trying to run 4 x Zeus blizzards on the one Raspberry Pi, and it doesn't seem to be coping. I am using bfgminer 4.4.0 and even at a lower clock of 308 I am getting like 20% HW errors and all sort of problems, like sometimes not all of the blizzard will start and I have to quit bfgminer and launch it again, I often get ZUS 0: Comms error (werr=1) and other bad looking messages. The CPU load is about 1.5.

Anyone know the practical maximum of Blizzards you can run of a single Pi?