Simply put - different sites use different test equipment, use different procedures (1m away vs 70 cm away vs 1ft away, etc) and have different ambient noise environments. Testing for noise is easy to do in a crappy way and very hard to do in a good way.
True. Which sites would be considered reliable by SPCR in terms of PSU reviews and audibility?
If I knew beforehand I would have researched my power supply in terms of audibility much more intensively.
Are you saying that your PSU is actually too much loud?
Heh, no. It's fine at current load (the fractal r4 fans are actually louder than I anticipated.. also looking into getting those replaced sometime). My concern stems primarily from the noise I may experience if I add fans (beyond the 2 stock fans), an ssd, and a graphics card (and maybe some LED lights).
Although it has begun to whine..... very annoying. Going to get it swapped with a new one of the same model and hope it doesn't develop the same issue..
Edit: The PSU has not begun to whine. I was mistaken. The HDD is vibrating in the sled it is held in and causing the filter at the bottom of the case to shake (so it sounded like the noise was coming from the PSU). I've since fixed the problem by adjusting the filter although I can still hear the drive vibrating and creating a buzzing noise inside the case.
Edit #2: Thought I'd add this in for anyone who may happen to stumble across this topic when googling fractal r4 and noise/buzzing/HDD issues - the side panel will also vibrate with the HDD to create nose if the panel screws aren't in tight enough.
Also, the fan on this PSU (adda ad1212mb-a70gl) is rated at 38db...
Just because the XFX Pro 750w is based on a Seasonic X-750 does not mean that it is one. One difference is the Adda ad1212mb-a70gl fan which is not the same as the one fitted to the X-series. It is the same as the one fitted to Seasonic's G-series and the older ranges such as the MII and SII models. This fan is rated at around 2200 rpm top speed and if you push it much above 50% of PSU capacity it will be noisy.
Another difference is that XFX seem to have adopted a far more aggressive fan profile than Seasonic. But given that XFX's market would primarily be hard-core gamers who would be more worried about cooling than noise, that's understandable. Most gamers would fit the XFX bottom mounted, fan up and given sufficient case airflow this would help limit the temperatures of the PSU and maybe PSU fan noise.
What's odd is that in the bit-tech review I linked, the XFX Pro 750W Black Edition, Seasonic X-Series 750W, and PC Power & Cooling Silencer MK III 750W were all rated at the same noise levels for 100W, 300W, and 500W loads.