Btw, I don't really know how the A3000 PSU looks like, but I found out on my A4000 that most of the noise isn't caused by the old fan, but by the air intake and outflow holes in the PSU housing. Changing the fan should be the starting point, of course, but completely cutting out the PSU front and back and putting modern fan protectors made of round wires did much more for my A4000 noise output.
