The Quietest PSU Picks – Hardware Busters

Some users don’t put performance on top, but silence. This article is dedicated to these users because even the PSU can be a notable noise source, especially high power density or low-efficiency ones. Since I have access to Cybenetic’s internal database, hosting thousands of results, it isn’t hard to extract the required information. I will base my findings on 115V and 230V input, which typically is the worst-case scenario since efficiency is lower at lower voltage input. If I have many entries in a category, I will limit them by listing only the PSUs with below 30/35/40 dBA average noise output depending on the Wattage.

UPDATED 13 February 2023

I will only include in today’s quietest PSU picks article only products available on the market. Performance doesn’t count, nor does efficiency, although silent PSUs are usually highly efficient. Moreover, I will have an extra category for the passively-cooled PSUs, which are not so many and have limited capacity.

If you want the best PSU picks according to performance or ATX v3.0 compatibility, you should look at the articles below:

I will put some affiliates link for the products that I will recommend. You don’t pay more by using these affiliate links, but you help me keep this site alive and kicking!

Output Noise Measurements Test Set-Up

In the schemes below, you will find an outline of my hemi-anechoic chamber with the exact placement of the MIC and the DUT. I strictly follow the corresponding ISO Standards:

  • ISO7779: 2018 – Acoustics – Measurement of airborne noise emitted by information technology and telecommunications equipment.
  • ISO 11201:2010 (E) – Acoustics – Noise emitted by machinery and equipment – Determination of emission sound pressure levels at a workstation and at other specified positions in an essentially free field over a reflecting plane with negligible environmental corrections.

Background Noise Calculation

The background noise in our chamber can range from 5.5 dBA to 8 dBA, depending on the external conditions. Therefore, to have the best possible conditions, I prefer to take noise measurements at night, when the ambient noise is lower than during the day.

In no case the background noise can exceed the sound of interest, and in practice, the output level of the DUT has to be at least 3 dBA higher than the background noise for the measurement to be accurate. Still, a correction has to be applied to get the correct result. The background noise correction is defined as K1, and the amount of the measured source level is reduced to obtain the background noise-corrected source level.

The procedure for measuring a DUT’s noise output is the following:
• Measure the total noise level (LDUT + LBG) with the DUT in operation, paying extra attention to its lowest noise output mode.
• Measure the background noise level (LBG) with the DUT switched off.
• Calculate the difference between the readings mentioned above (LDUT – LBG). If it is less than 3 dBA, the background noise is too high to measure accurately. A correction must be applied if it is within a 3-10 dBA range. There is no need for correction if the difference is greater than 10 dBA, but I still use it for up to 20 dBA differences.

The formula for calculating the noise source without the influence of the background noise is the following:

In a spreadsheet, the formula above can be given as 10*log(10^(LDUT/10)-10^(LBG/10))

The chart below can be used to make background noise corrections to the source signal.

450W500-600W601-700W701-800W801-900W901-1000W1001-1250W1251-1500W>1500WSFX PSUsSFX-L PSUsPassive PSUs


In this category, most PSUs have low efficiency; hence energy losses are increased, making it a challenge to have relaxed fan speed profiles. Nonetheless, there are low average noise output units, like the Corsair CX450M, the Asus TUF 450B, and the XPG Pylon 450.


Buy Corsair CX450M


Buy Asus TUF-450B-Gaming


be quiet! has the quietest 550W PSU entry, followed by Corsair and Super Flower.


Buy be quiet! Straight Power 11 Platinum 550W


Buy Corsair RM550x (2021)


Buy Super Flower Leadex III Gold 550W


be quiet! leads the silence race in the 650W category, followed by Cooler Master and Corsair.


Buy be quiet! Straight Power 11 Platinum 650W


Buy Corsair RM650x (2021)


Asus has the quietest 750W PSU, with the new Corsair RM750x Shift following. The German brand, be quiet! takes over third place.


Buy ASUS ROG Strix 750


Buy Corsair RM750x (2021)


Buy be quiet! Dark Power 12 750W


Asus also dominates in the 850W category with SilverStone, and be quiet! following, with products having below 20 dBA average noise output, which is excellent for this capacity.


Buy ASUS ROG Strix 850


Buy SilverStone HELA 850R Platinum


Buy be quiet! Dark Power 12 850W


The 1000W category includes dead silent PSUs, with two below 15 dBA average noise output, which is a fantastic result for a high-capacity unit. Asus has two units in the top three, and FSP’s Titanium PSU takes over second place.


Buy ASUS ROG Thor 1000W


Buy Corsair RM1000x Shift


Buy Seasonic Prime TX-1000




In the high-power category, be quiet! achieves first place, with Cougar taking over the following two places.


Buy be quiet! Dark Power Pro 12 1200W


Buy Thermaltake Toughpower GF3 1200W


Buy Corsair RM1200x Shift


The dominance of be quiet! continues in the 1251-1500W category with the Dark Power Pro 12. Corsair is following, with XPG coming third.


Buy be quiet! Dark Power Pro 12 1500W


Buy Corsair HX1500i



The Asus Rog Thor 1600W achieves an impressive result, which is far away from the competition. Seasonic comes second, with Corsair’s AX1600i taking third place in the 115V noise chart. I don’t have 230V data for the Rog Thor 1600W, but I am sure it would achieve first place in the corresponding chart.


Buy Seasonic PRIME-TX-1600


Buy Corsair AX1600i


As crazy as it sounds, because it is the highest capacity SFX unit, the Cooler Master V1100 SFX Platinum achieves the lowest noise output, followed by the budget Raijintek Ermis 550B and the SilverStone Extreme 850R Platinum.


Buy SilverStone Extreme 850R Platinum


Buy Raijintek Ermis 550B


Asus has the upper hand in the SFX-L category with its Loki models. Seasonic’s unit comes third. Corsair should take care of the fan speed profile of the SF850L to drop it lower. For the SF1000L, there is room for improvement, too.


Buy Asus 750W ROG Loki SFX-L


Buy Asus 850W ROG Loki SFX-L


Buy Seasonic SSR-500 SGX


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12 thoughts on “The Quietest PSU Picks – Hardware Busters

  1. Great review.

    Asus,Corsair and BQ , are killing it across the watt ranges. Personally i’d tend towards the Corsair ones.

    But what REALLY stands out is the CoolerMaster V1100 SFX Platinum. I mean wow,omg and 3 lols, combined, 28 “and change” dbA ONLY, from a 1100W SFX !!!

      1. Question for you, are you going to review the Dark Power 13 1000W and the Seasonic Vertex gold 1200W? IMO, those are the two units that are the most interesting ATM.

        As an Electrical Engineer, I really like your reviews because you put emphasis on things like Power Factors, voltage regulation quality, inrush current… and so on.

  2. Did you test all of these yourself with bought units or were they pre-prepped units etc?

    My Be Quiet 13 Dark Power 13 1000W has a horrible noise, louder than anything else in my case. The ROG Thor 1000W has a great review by yourself. Was there any annoying noises at idle/low loads? My experience with zero fan modes is that they’ll kick in intermittently under minimal load as they get warmer anyway..

    1. We test everything in the lab. You should send this be quiet! PSU back because such a noise is not justified.
      The Rog Thor 1000W didn’t have any noises. If there is something, I write it in the review. Coil whine noise doesn’t have to do with the PSU only, but it can be a combination of parts that lead to it.

  3. I had a question on why the Asus ROG Thor 1200 W is missing in its category.

    Is there something about this unit that it would not top the list as the 1000W and 1600W Thor do?

  4. hi! Thanks for the reviews!
    question, are these test made while full load? im looking for a silent psu for an recording studio and most of the time it would not be using it at full power. I was looking for one psu with hibrid mode like the asus 750G. would you recomend this type of solution


    1. Hi! I measured average noise output, from minimal load up to full load, so the results provided are as accurate as they can be, representing real-life conditions.

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