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Seasonic X-460 Fanless 460W 80Plus Gold Silent Powersupply Review

Seasonic X-460 Fanless 460W 80Plus Gold Silent Powersupply Review - PCSTATS
Abstract: In this review PCSTATS is testing out an entirely fanless, silent 460W power supply from Seasonic's modular "X" series. There aren't very many fanless power supplies on the market so this is a bit of a treat.
 80% Rating:   
Filed under: Power Supply Published:  Author: 
External Mfg. Website: Seasonic Aug 09 2012   Max Page  
Home > Reviews > Power Supply > Seasonic SS-460FL

Power Draw Tests and Conclusions

Seasonic Load Tests Source: Seasonic

When looking at the Seasonic Power Supply test results we see two values, wattage and volt-amps. Since it might not be clear what they measure, here's a brief overview.

The volt-amp (VA) value is how much real power is being consumed by the power supply being tested to provide the wattage (W) value. The higher the VA value is, the more electricity is being used by the power supply. Because no electrical device is 100% efficient, there will always be some loss when converting AC to DC. The closer the Volt-Amps (VA) and Wattage (W) figures are, the more efficient a power supply is. This is called the Power Factor: Watts / Volt-Amps = PF.

Since we're testing with a 120W dummy load, the load on the power supply (wattage) should be as close to this figure as possible. Anything above this load in apparent power describes the overhead and wasted energy (given off as heat) for the particular power supply being tested. For the unloaded tests, the wattage and volt-amp figures should be as close as possible to one another. The lower the figures are, the less power is being wasted.Measurements were taken with an Extech 380803 Power Analyzer.

Seasonic Power Load Tests
Power Supply Model Wattage Test Type Loaded Unloaded
Seasonic SuperTornado 400 W
Active Power 177 W 6 W
Apparent Power 182 VA 7 VA
Vantec iON2 350 W Active Power 192 W 10 W
Apparent Power 277 VA 21 VA
Antec TruePower 330 330 W Active Power 195 W 22 W
Apparent Power 289 VA 38 VA
Ultra X-Connect Green UV 500W 500 W Active Power 193W 22 W
Apparent Power 307 VA 40 VA
AOpen Silent Power AO400-12AHN 400 W Active Power 179W 9 W
Apparent Power 275 VA 18 VA
Seasonic S12-430 430 W
Active Power 179W 6W
Apparent Power 180VA 9VA
PC Power and Cooling Turbo-Cool 510 Express/SLI

510 W

Active Power

200 W

29 W
Apparent Power 202 VA 32 VA
HEC Ace Power 580UB

580 W

Active Power

183 W

12 W
Apparent Power 272 VA 26 VA
HEC Win 550UB 550 W Active Power 184W 10W
Apparent Power 263VA 22VA
Akasa PowerPlus AK-P550FF 550 W
Active Power 194W 38W
Apparent Power 197VA 40VA
AOpen Prima Power AO700-12ALN 700 W
Active Power 172W 3W
Apparent Power 181VA 9VA
PC Power & Cooling Turbo-Cool 1KW 1000 W
Active Power 205W 25W
Apparent Power 207VA 32VA
Seasonic S12 600 600 W
Active Power 164W 7W
Apparent Power 173VA 9VA
Mushkin Enhanced XP-650 650 W Active Power 192W 22W
Apparent Power 279VA 43VA
Seasonic S12 Energy Plus SS-650HT 650 W
Active Power 150W 7W
Apparent Power 150VA 10VA
Seasonic M12 700W 700 W
Active Power 161W 8W
Apparent Power 165VA 11VA
Corsair HX620W 620 W
Active Power 171W 8W
Apparent Power 173VA 12VA
Zalman ZM600-HP 600 W
Active Power 173W 5W
Apparent Power 175VA 9VA
HEC Zephyr 650 650 W
Active Power 185W 12W
Apparent Power 190VA 17VA
GlacialPower GP-PS550BP 550 W Active Power 178W 6W
Apparent Power 269VA 17VA
Cooler Master Real Power Pro 750W 750 W
Active Power 158W 6W
Apparent Power 163VA 9VA
Cooler Master Real Power Pro 750W 750 W
Active Power 158W 6W
Apparent Power 163VA 9VA
Seasonic S12 II 500W 500W
Active Power 145W 7W
Apparent Power 148VA 10VA
Enermax Infiniti 720W 720W
Active Power 179 W 12 W
Apparent Power 181 VA 18 VA
Active Power 172 W 9 W
Apparent Power 193 VA 12 VA
PC Power & Cooling Silencer 750 Quad 750
Active Power 168 W 12 W
Apparent Power 175 VA 15 VA
Enermax Galaxy EGX850EWL 850 W
Active Power 184 W 11 W
Apparent Power 193 VA 16 VA
Seasonic M12D 750 750W
Active Power 169W 7W
Apparent Power 173VA 9VA
Seasonic S12D 850 850W
Active Power 148W 7W
Apparent Power 149VA 10VA
Seasonic X-750 750W
Active Power 139W 6W
Apparent Power 141VA 8VA
Seasonic X-460 (SS-460FL) 460W
(A-PFC F3)
Active Power 162W 10W
Apparent Power 164VA 14VA
Seasonic X-760 (SS-760KM) 760W
(A-PFC F3)
Active Power 161W 6W
Apparent Power 164VA 10VA

The Seasonic X-460 power supply uses 162W of power when a 120W power load is hooked up, which is 74% efficiency at 26% load of its rated 460W power output. The Seasonic X-460 Fanless is rated for 88.18% efficiency at 20% load according to 80Plus specs, so the results we're seeing here are apparently a bit off from the 80 Plus Gold certification. Power factor is 0.98PF.

Unloaded power draw is about 10W, or 14VA for a power factor of 0.75PF.

Conclusions: Fanless for itself, rest of the computer on its own

The 460W Seasonic X-460 Fanless is an interesting power supply for a niche section of DIY computer builders. Used in an appropriately ventilated computer case it opens up a world of quieter home theatre PCs, or perhaps laboratory or recording studio environments where noise from traditional power supply fans is unwanted. At 460W, the X-460 is well sized for the power demands of mainstream computer systems built around motherboards or processors with integrated graphics, although it does include two PCI Express auxiliary power connectors for discrete videocards.

The computer case is the key variable in the silent computer equation, it's also the hardest for us to comment or give guidance on.

The reliance on convective cooling means the Seasonic X-460 Fanless power supply is not suitable for all environments. A climate controlled office is likely fine, a hot un-airconditioned New York apartment in the middle of a summer heat wave.... likely not. Similarly, a computer case without any vents above the power supply, or worse where the top of the power supply butts up against the metal panels is simply not going to work here.

Seasonic are pretty vague on what constitutes a "well designed system chassis," so a certain amount of common sense from the user is required. Ensure the case has good ventilation above the power supply and sufficient cool air intake vents below it. It's really a case by case question you'll have to judge for yourself. But make no mistake, fanless does not mean silently sealed up in a closed box. Fanless means increasing the number or size of cooling vents so natural convection cooling can work.

There is also the rather tricky question of what to do with all the heat dumped into the PC chassis by other components; the processor, motherboard VRM, motherboard chipset, videocard or IGP, hard drives, expansion cards and so forth. Seasonic have designed the X-460 Fanless to "be responsible for its own cooling and functionality". Choice words that perhaps don't underscore this point well enough - the X-460 Fanless power supply is intended to cool itself and only itself. Most computer systems rely upon the power supply to exhaust hot air from the top of the chassis, draw hot air away from the CPU thermal solution and motherboard's passive VRM heatsinks. What happens when that active exhaust port is removed?

The best answer we can give is that the Seasonic X-460 Fanless is not designed for these tasks and by virtue of its ventilation design will not absorb these tasks either. Thus while the Seasonic X-460 Fanless is built to replace any standard 460W power supply in terms of power delivery, it's not going to fulfill all the responsibilities usually associated with an actively cooled PSU in the computer system. It's a fine point of distinction, but a crucial one to be aware of should you embark on a totally fanless computer system build.

In and of itself, Seasonic have manufactured a very satisfying PSU that's evident the moment you lift it out of the box. The modular cables are sufficient for its power output, the build quality is enviable and it produces no noise from fans or humming capacitors. Retailing for about $160CDN ($160USD, £70 GBP), the Seasonic X-460 Fanless (SS-460FL) isn't cheap, but is well built, stable and efficient. It's a harder point to recommend or not, I think in this case a fanless power supply is one component best selected by DIY computer builders who know enough to answer that question themselves.

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Here are a few other articles that you might enjoy as well...
- Seasonic X-750 750W 80Plus Gold Power Supply Review
- Seasonic S12D-850 850W Power Supply Review
- Seasonic M12D-750 750W Power Supply Review
- PC Power & Cooling Silencer 750 Quad 750W PSU Review
- Enermax Galaxy EGX850EWL 850W Modular Power Supply Review
- Coolmax CUQ-1200B 1200W Power Supply Review
- Enermax Infiniti 720W Power Supply Review
- Seasonic S12-II 500W Power Supply Review
- Cooler Master Real Power Pro 750W Power Supply Review

< Previous Page © 2019 PCSTATS.com Power Supply News»


Contents of Article: Seasonic SS-460FL
 Pg 1.  Seasonic X-460 Fanless 460W 80Plus Gold Silent Powersupply Review
 Pg 2.  Appearance and Physical Specifications
 Pg 3.  Modular Cables and a Look Under the Cover
 Pg 4.  — Power Draw Tests and Conclusions

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   09 / 23 / 2019 | 9:12AM
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