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Silver metal box with a 120 mm fan and black cables

Silverstone

Silverstone SST-ET550-B 550 W power supply

SKU CH-NKHZ-9AMJP MPN SST-ET550-B

ATX12V v2.4 unit delivers 550 W with 80 PLUS Bronze efficiency and a quiet 120 mm fan

  • Max wattage550 W
  • Power efficiency82% - 85% @ 20% - 100% loading
  • Fan configuration1 x Single 120 mm Silent Fan
  • Power factor correctionActive PFC(PF > 0.9 at full load)
  • Main power connector20+4Pin
  • 12V railsSingle
  • Reliable power delivery from 550 W continuous output
  • Efficient operation with 80 PLUS Bronze certification at 82 to 85 percent
  • Quiet cooling via 120 mm fan rated at 18 dBA
  • Stable voltage from Active PFC with power factor above .9
  • Broad compatibility through 100 to 254 Vrms input range

Essential Series 550 W ATX power supply

The Silverstone SST-ET550-B is an ATX12V v2.4 unit rated for 550 W continuous output. It uses a single +12 V rail capable of 42 A and holds 80 PLUS Bronze certification for 82 to 85 percent efficiency across 20 to 100 percent loading. A 120 mm fan runs at 18 dBA for quiet operation.

ATX12V v2.4 limits and protections

The design follows the ATX12V v2.4 standard with active PFC above .9 at full load and accepts 100 to 254 Vrms at 47 to 63 Hz. Over-voltage, over-power and short-circuit protections are built in. The single +12 V rail simplifies load balancing for modern components.

Check connectors and clearances before ordering

Verify your motherboard needs a 20+4 pin main connector and an 8/4 pin EPS connector. Two 6+2 pin PCIe plugs serve most mid-range graphics cards. Six SATA, three peripheral and one floppy connector cover drives and accessories. Ensure the case fits a standard ATX depth unit.

How it compares

Measured against everything we stock in ATX Desktop Power Supplies, at today’s prices. Recalculated every night.

Price $48.99
Cheaper than about 91% of the 10,869 comparable items (median $142.99).
Max wattage 550 W
Lower than about 82% of the 930 comparable items (median 850 W).

New to this? Buying PC parts with Monero — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameSilverStone
Product lineEssential Series
Model nameSST-ET550-B
Product typeATX12 V v2.4
Ports & slots
PCIe power connectors2 × 6+2-Pin
SATA power connectors6
Output type+3.3 V@18A, +5 V@16A, +12V1@42A
Connection types1 × 24 / 20-Pin motherboard
1 × 8 / 4-Pin EPS / ATX 12 V
2 × 8 / 6-Pin PCIE
6 x SATA
3 × 4-Pin Peripheral
1 × 4-Pin Floppy
Power
Max wattage550 W
Power efficiency82% - 85% @ 20% - 100% loading
Power factor correctionActive PFC(PF > 0.9 at full load)
Main power connector20+4Pin
12V railsSingle
Efficiency certification80 PLUS BRONZE Certified
Overvoltage protectionYes
Supply voltage100–254 Vrms
AC input frequency47–63 Hz
Size & build
Product dimensions3.39 in × 5.91 in × 5.51 in
Product weight3.28 lb (1.49 kg)
Shipping weight2.27 kg
Package size305 × 229 × 102 mm
More details
Fan configuration1 x Single 120 mm Silent Fan
Mean time between failures100,000 h

Questions about this item

Will the single 12 V rail deliver enough current for a modern graphics card?

The single +12 V rail is rated at 42 A, providing ample power for GPU and CPU combined.

Does the unit include the PCIe cables my graphics card needs?

Two 6+2-pin PCIe connectors are supplied, covering both 6-pin and 8-pin graphics card sockets.

Is the power supply compatible with a standard ATX motherboard and SATA drives?

Yes, it has a 20+4-pin main connector, an 8/4-pin EPS connector and six SATA power plugs.

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