...
It's most likely USB port power (5V) due to a missing trace on the pcb, so they added that jumper.
Definitely an older version pcb.
That's my educated guess.
Wolfey2014
I think the same, my modules have a slight different layout in that spot
By the way, I'm just desoldering the fans wires (too loud for scrypt mining!) but I would like to found a solution to easily reconnect them if needed...any idea?
I'm thinking to something like a male and female adapter (like that ones

)
connected together and with the fan lines injected as well, but probably the result is pretty bulk...
