I have seen on Eligius your ultra recent switch off, if you have powered off this miners ,you can watch at the revision "letter" for the oldest batch ASIC board.
On top corner , front right (the other side from PCI-e connector).
My worries r about mix different rev. cubes on the same controller, on master thread "Swedish ASIC miner / KNC Firmware" it was considered source of trouble.
Probably this issue does not exist on bonus batch (all six cubie Neptune?)
Thanks.