As it's constantly on sale for USD33 here, I purchased one Silverstone ST40F-ES for a friend's modest gaming PC. For noise level, it's as quiet as Seasonic S12 series at light load. I can't hear bearing noise at close proximity. Sorry that I can't comment on high load as the PC can only consume 170 AC watts. I'm satisfied with this budget PSU for its out-of-box acoustic performance.
Btw, Chinese reviews stated fan speed 660RPM at low load. Frankly, it's the review that made me pull the trigger.http://digi.163.com/12/0201/05/7P5FU4GO00163HEA.htmlhttp://power.zol.com.cn/196/1962060.html