"The SilverStone Strider Platinum ST75F-PT 750W is silent to fairly quiet power supply, depending on the amount of power being drawn. Under idle level loads (Less than approximately 100W), the ST75F-PT is inaudible, because the fan is shut off completely. Under regular loads (Above 100W but below 300W), the 750W Strider Platinum is reasonably low noise."
Jonathan Kwan - APH Networks.
SilverStone 750w Strider ST75F-PT PSU review by APH Networks - Introduction & Conclusion.