Finally got my miners set up! Woo Hoo!

However, I have some support questions:

1) I am getting hardware errors on both units: one is running at between 1-2%, the other between 0.2-.05%. Is this acceptable or does it imply I have a faulty unit?

2) What is a safe temperature to run these at? My hottest one is running at 45C being clocked at 270. I'm working on getting a fan for the backsides, which seems to help.

3) Anyone know how to set temperature safety in BFGMiner? I understand you can set it to turn off if a certain temperature is reached as a safety mechanism, but I can't figure out how to set that up from reading the readme file.

Thanks.