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Some power supplies exhibit noises that come from components other than the intake fan. These noises can sound like hissing, buzzing or a high pitched whine. These noises can come and go and can be difficult to troubleshot for a couple of reasons. One reason is that the noise can change, or be completely absent, depending on the load on the power supply. I'll get into more detail about that in a little bit, but what this does mean is that a PSU that makes a noise in one PC during one game or benchmark program may not make the same noise in another... or may make no noise at all. The other reason is that often these noises can be at such a high frequency that only some people are actually able to hear them. Many people, especially those over 25 years of age, cannot hear noises over 15kHz, while others can hear noises all of the way up to 20kHz. So you can have a PC sitting in a room, with a power supply that's making a high pitched squealing noise, and if two people are sitting in the same room; one of them may be able to hear the noise while the other one hears nothing at all. Above we have a picture of the main transformer and the +5VSB transformer out of our new RM Series power supplies. If we cut all of that tape off... The primary stage has a single Taiwanese 105c rated Elite Jinshan cap. These caps are pretty good, even if they fall a bit short of the highest grade caps from Japanese brands such as Nippon Chemi Con or Rubycon. What we've started to do at Corsair is carefully vet our manufacturer of transformers to not only meet performance criteria, but also to meet the criteria we know will give our customers zero noise in their power supply. Details about the extent of our regulation by the Financial Conduct Authority are available from us on request.
Resonant LLC Topology with DC-to-DC Conversion: Provides clean, consistent power and enables use of more
energy-efficient sleep states. Correctly testing power supplies is a complex procedure and KitGuru have configured a test bench which can deliver up to a 2,000 watt DC load. Supports Modern Standby sleep mode for extremely fast wake-from-sleep times and better low-load efficiency. The rear of the box highlights some key features, including the zero RPM mode, low noise characteristics.
The modular bay is home to a plethora of solid capacitors for output filtering. The unit also has OVP, OCP, SCP, OPP and OTP protections in place. The load regulation of this power supply is solid throughout, with only minor dip on the +12V rail. Corsair RM1000e Today to test the Power Supply we have taken it into our acoustics room environment and have set our SkyTronic DSL 2 Digital Sound Level Meter (6-130dBa) one meter away from the unit. We have no other fans running so we can effectively measure just the noise from the unit itself. Another source of so-called "coil whine" is actually from capacitors. While many people think that a capacitor that's making noise is a leaking capacitor, the truth is that a capacitor can make a noise similar to "coil whine" for the same reason a coil or transformer will make these noises. The inside of a capacitor is made up of a dielectric material and a metallic film. These two thin layers are rolled up to form the capacitor. Once again, tolerances are important. If there is any non-uniformity in the coil of two layers, a mechanical resonance can occur that produces a high pitched noise.
We test ambient temperatures at 35c in our environment to greater reflect warmer internal chassis conditions. Aluminum electrolytic capacitors, the caps that look like little cans, are rolled up with an electrolyte soaked paper. That paper can actually absorb the mechanical resonance that can create noise. But the capacitors shown above use a metalized polypropylene as a dielectric. This "plastic film" can vibrate with certain frequencies, just like our copper windings on our coils and transformers, and produce a high pitched noise. Over the past few years, Corsair has refined its ZeroRPM fan technology. Our power supply fans remain silent until 20%, 40% and even 60% load. We've developed quieter fans with quieter fan motors and fan blades designed specifically for moving air through the crowded PCB of a power supply. But we haven't forgotten that there are power supply noises that come from other than from the fan, and in this article I will detail some of the additional steps we have taken to limit PSU noise in our new RM Series power supplies. A large fan sits behind a grill on the top of the chassis. We will take a closer look at the fan when we open the chassis shortly.The efficiency results are excellent, peaking at 92.6% at close to 55% load. This drops to just under 90% efficiency at full load. These are really very positive results for an 80 Plus Gold rated unit. We've found that, under certain circumstances, these types of capacitors can make more noise than any others. Why? Corsair have opted for their traditional bright yellow box artwork with an image of the unit on the front.
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