Hi, I have an Antec Signature 650w PSU and it doesn't whine even in my system with a GTX260. The GTX260 itself whines (or rather it did till I got at it!) and made my previous NeoHE whine horribly.
Not sure I can comment on the noise level of my Signature as it's had it's fan swapped! For reference the swapped fan gets up to 800~1000rpm (80mm fan remember) when under sustained [email protected]
load on the CPU and GPU and the room temp is high. On hot days (for England) it probably reaches 25Â°C+ in my room.
I would guess the original fan would be similar in speed but couldn't spin down as low as the swapped one. (<600rpm vs 750rpm, not that the stock fan was noisy at all really!)