I have the "Antec High Current Pro 1200W Modular '80 Plus Gold' Power Supply", which i think has all the pc-ie power all on separate rails etc As i say, i've had SLI 580s happily for a long time. I can switch em over i guess, i'm happy to try anything.
dumb suggestion do your screens go to power save mode after x minutes?
if they do try set power mode to never shut off.-
I try anything when I encounter such