The 650W MWE 80Plus White (MPE-6501-ACABW-AU) that I received has a high pitch sound (coil whine) which is quite annoying. I have tried this PSU on 3 different computers, all with the same result. The high pitch sound can be heard from around 5m away, in an environment with low background noise. This noise starts as soon as you start up the computer and stays until you shut it down again. If you plan on having your computer case on your table or in the open, then I would suggest a different power supply. However if your case is under your table, and you use headphones, then you shouldn't hear it. I performed some rudimentary testing, and believe the issue is related to the 12V 8 pin EPS for powering the CPU. When running a CPU intensive load (Prime95) the high pitch sound frequency increases. However, when loading the graphics card (Unigine Heaven Benchmark), the high pitch sound appears to reduce and sometimes cuts out completely (intermittent). Must be something in the internal electrical which is countering the vibration depending on what parts are loaded... Other than this high pitch coil whine issue, the power supply is actually quite good. I like the flat cables, which makes cable routing quite easy. The lengths of the cables are good, and the spacing (distance) between multiple connectors on a single cable (for powering SSD/HDD) is better than most other power supplies. The number of connectors and general build quality is also quite good. If there was no coil whine, then I would have given this power supply 5 stars, but alas it is not to be. I picked this up as the price was cheap in comparison to other power supplies of this specification (A$79). In future I would probably just stick with Corsair power supplies, as they have never let me down previously. They do cost a bit extra, but I feel you are not playing the lottery, and you get what you pay for.