Noisy power steering pump

[TG1]

I noticed this with my old 1998 3.7 which I didn;t have very long, annoying whine from the PAS pump - most noticeable between 1-2k rpm but just lived with it.

My new to me 2000 3.7 quattro made the same noise but even louder when I bought it. So system flushed, strainer cleaned and correct fluid made no difference at all. Fitted a used pump as I was getting some other parts, maybe a slight improvement but still there and still annoying!

I know part of the problem is that the rest of the car is sooo quiet that any noises are not drowned out but this can't be right.

Anyone had this?