Sadly BFL stuff is not easily overclockable. I'm averaging about 715Gh/s from 1 minirig SC and 4 Singles(think 12 singles), but they're *HOT* and require 10x the attention the 9 Avalons do. I have two AC units cooling them(32k BTU) and they still overwhelm the ACs during the day.
How did you overclock your singles to 89GH/s per board? EDIT: divide by 12 not 8 dummy!
