Just toasted a 850 watt psu.
I realiase now that the psu had two 38 amp 12v rails providing 336 watts each. As it happens one rail had one gpu on it while the other had 2 on it and was thus over-loaded.
Now I have the replacement on order I have this question.
Is there anything stopping me from "bridging" the two rails? I'd do it by splicing the wires together outside the PSU. I'm fairly familiar with DC and can't immediatly see an issue with this but thought I ought to ask.
Also more to the point, if I can do that, then whats to stop me doing it across several PSUs ?
Yes you can. Internally the PSU most likely has a single 12V output and the only thing separating the output rails is a current limiting resistor.