be quiet! SFX L Power 500W is small powersupply, but not quite SFX size. It is a bit larger to fit in a 120 mm fan which is a big improvement over the usual 80 mm fans that SFX powersupplies are known for.


Quick key facts

  • 80PLUS Gold certification (up to 92% efficiency)
  • Multi-GPU support with four PCIe connectors
  • Full cable management for maximum build flexibility
  • Temperature-controlled 120mm high-quality fan
  • SFX-to-ATX adapter bracket for usage with larger case sizes
  • 3-year manufacturer’s warranty


Technical specifications

Continuous power (W) 500
Peak power (W) 550
Form factor ATX 12V PSU DG 1.31 / SFX12V Version 3.3
Topology Active PFC + LLC + DC-DC
Power consumption in standby (W) 0.14
Average life time (h / 25°C) 100.000


be quiet! “SFX L” compared to ATX size

Dimensions without cable (L x W x D), (mm) 64 x 125 x 130



Delivery Volume

In the box you get the powersupply, screws, AC power cord (1500 mm), user manual in many languages (EN, DE, FR, PL, ES, RU), modular cables, and a SFX-to-ATX adapter bracket.



Cable management / Connectors

All cables are modular and shorter. With modular cables you can leave out the ones you dont need, and can install components easier and have better airflow. With shorter cables you also get an easier installation time, and also better airflow, win-win! Finally shorter cables!

Using this powersupply in an ATX case could be a problem due to the shorter cables. You are much better off using this powersupply in a Mini ITX case or Micro ATX case.




Here is a Node 304 Mini ITX case from Fractal Design with the bracket installed. Installation went quick and easy. With a powersupply this size you get more room for bigger graphicscards in this case and more possibilities to organize cables.



SFX L Power has an 80PLUS Gold certification which is great for power efficiency, low temperatures and lower noise. 92% efficency at 50% load is very good.

Efficiency (%) at 230V, 20% load 90.1
Efficiency (%) at 230V, 50% load 92.2
Efficiency (%) at 230V, 100% load 90.8



12V single rail operation Yes
+3.3V (A) 20
+5V (A) 20
+12V1 (A) 41.7
-12V (A) 0.3
+5Vsb (A) 3
Max. combined power 12V (W) 500
Max. combined power 3.3V + 5V (W) 105
Hold-up time (ms @ 100%) 16.7



Fan type high-quality fan
Motor technology 4-pole fan motor
Bearing technology Sleeve
Fan size (mm) 120
Max. fan speed (rpm), temperature-dependent 1,350
dB(A) at 20% load 9.9
dB(A) at 50% load 14
dB(A) at 100% load 28.5



When computer is idle, you have no noise at all, it is super silent. It continues to be super silent even at moderate load of ca 200-250 W. There is no electrical noise, no clicks, no crackling noise.

Highest load could be quiet enough for most people.

For a silence enthusiast, 70% load of 350 W would be the roof, which is enough for a efficient and powerful computer, but maybe not an overclocked one.




be quiet! SFX L Power 500W is great little powersupply that is super silent operation in idle and during moderate load. This is perfect for a silence enthusiast who does not need to max load of 500 W. We wish to give our silver award to be quiet! SFX L Power 500W.



  • Build quality
  • 80Plus gold efficiency
  • Super silent in idle and moderate load
  • Modular cables
  • Short cables
  • Included ATX-bracket



  • Price
  • Not super quiet in higher load