BFL's power supplies suck, I have my 60gh/s bfl miner and a 25GH/s BFL sitting behind my pc with a 1050W gold PSU with the pcie-E cables pulled out of the back of the case through the water cooling holes with the rubber grommets on them so it looks all pretty and doesn't leave anything ugly looking, or jerry rigged/fire-hazard like, and they run fine.  I did this after the BFL psu's blew out after about a month each.