The longest I have been able to get my rig to run is 12 hours. I don't know what's causing it, but it's freezing up and I have to do a hard reboot which isn't convenient since I normally use team viewer. I posted my settings at
https://bitcointalk.org/index.php?topic=623409.msg7036775#msg7036775 if anyone can look at them and give me some suggestions. If the miner was just crashing I wouldn't care so much because that's easy to restart. It's just the hard reboots that are killing me.
Working on figuring out settings for gigabyte r9-270's still, I'll post when I find a good config that runs for an extended period. I also use teamviewer...someone needs to make a power strip that can be toggled on and off remotely over the internet....That would be a lifesaver.
Try one to these. i believe you can run 1500 watts through it.