Rogue Leader :
I have a 750 B2 (Golden Green) as well as a 550 G2 (Leadex). Both fans are whisper quiet, however the Leadex one you literally can't tell its on.
That's what I was told leading me to believe I just got a bad one .... but after the RMA, the replacement G2 was just as loud. The B2 is quiet but it was purchased cause it was $45 and never breaks 250 watts ... fan never goes on.
As for "whisper quiet", whispers can be heard and are therefore I put "Whisper quiet" in the unacceptable category
On my desk... Enthoo Primo, side panels off 20 - 24 " from my ears..... 16 fans (10 radiator, 6 case) running at 375 - 425 rpm atm, 1250 watt Seasonic X series PSU, GFX cards water cooled.
Next Desk ... Enthoo Pro, side panels off ... (6) case fans, 1 GFX card (dual fan), stock CPU cooler, EVGA B2 750
Son's box ... Enthoo Luxe, (9) case fans .. 2 GFX card (4 fans), Swiftech H240-X AIO, EVGA G2 1000
With all systems under stress test (Furmark), the only sound in the room is the G2 1000 ... both the 1st and the 2nd.... and by that I mean, all of us have sat down more than once and hit the power button trying to turn on a PC that was already on. Not quiet ... simply inaudible.