cgminer --scrypt --gridseed-freq 8D7415695554=975,6D8213764857=825,8D98206C4849=875,8D8B46874955=1150 --gridseed-options=baud=115200,freq=750,chips=5 --hotplug 5 --scan-time 1 --queue 4 --no-submit-stale
pause
This let's you specify each and every miner independently, with default speed of 750 in this example.
This will let you specify exactly what speed to run that way you can minimize HW errors.
Oh, this only works on cgminer 3.7.2 (
https://www.google.com/search?q=cgminer+3.7.2&sourceid=ie7&rls=com.microsoft:en-US:IE-Address&ie=&oe=)