What is the output current of this PSU? I tried running pandaboard
with 2.5A PSU and it didn't even start. 3A seems to be the minimum.
These are 5V and on my multimeter I got almost 6V, but it's not just the voltage, but the constant supply of current.
Since this supply is very cheap, it doesn't have a way of ensuring constant current when the current is being temporarily diverged to another socket because of a peak usage from another device. I only have a small Atom server and my laptop, so there isn't much that could cause any substantial lack of current.