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Silver SFX-L power supply with 120 mm fan and modular cable sockets

Seasonic

Seasonic FOCUS SGX-650 650W 80+ Gold SFX-L power supply

SKU CH-JBQP-VWA2K MPN FOCUS SGX-650

Delivers 650 W through a 125 mm SFX-L frame with full modular cabling, 80 Plus Gold efficiency and a 120 mm fluid-dynamic-bearing fan that runs in fanless, silent and cooling modes

  • Max wattage650 W
  • Modular cablingFull Modular
  • Fan configuration1 × 120 mm Fluid Dynamic Bearing fan
  • Main power connector20+4Pin
  • 12V railsSingle
  • PCIe power connectors4 × 6+2-Pin

Model SFX-L 80+ Gold (650W) Full-Modular

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  • Compact SFX-L design at 125 mm length fits small chassis
  • Full modular cabling reduces clutter and improves airflow
  • 80 PLUS Gold certification cuts wasted energy during conversion
  • Hybrid fan control runs fanless, silent or cooling modes
  • 100,000 hour MTBF at 25 °C signals long-term reliability

Compact SFX-L 650 W unit

This SFX-L power supply delivers 650 W of continuous power in a 125 mm long enclosure. It targets small-form-factor builders who need full modular cabling and 80 PLUS Gold efficiency. The single +12 V rail supplies 54 A for modern graphics cards. All cables detach to keep the chassis tidy.

Hybrid fan control under load

A 120 mm fluid-dynamic-bearing fan runs in three stages: fanless at low load, silent at moderate load, and cooling when thermals rise. The unit maintains stable output across the 100–240 V input range with full protection circuits including OPP, OVP, UVP, OCP, OTP and SCP. MTBF is rated at 100,000 hours at 25 °C excluding the fan.

650 W on a single +12 V rail

The defining specification is 54 A on a single +12 V rail, which determines whether the unit can power a given GPU and CPU combination. Four 6+2-pin PCIe connectors and six SATA connectors support multiple drives and high-end graphics. Full modularity lets builders install only the cables required.

How it compares

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

Price $99.99
Cheaper than about 67% of the 10,869 comparable items (median $142.99).
Max wattage 650 W
Lower than about 70% of the 930 comparable items (median 850 W).

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Specifications

Product
Brand nameSeaSonic
Product lineFOCUS SGX
Model nameFOCUS SGX-650 (SSR-650SGX)
Product typeSFX 12 V / ATX 12 V
Ports & slots
PCIe power connectors4 × 6+2-Pin
SATA power connectors6
Output type+3.3 V@20A, +5 V@20A, +12 V@54A, +5VSB@3A
Connection types1 x MB (24/20 pins)
1 x CPU (8/4 pins)
4 x PCIe (8/6 pins)
6 x SATA
3 x Molex
Power
Max wattage650 W
Modular cablingFull Modular
Main power connector20+4Pin
12V railsSingle
Efficiency certification80 PLUS GOLD Certified
Overvoltage protectionYes
Built-in protectionOPP, OVP, UVP, OCP, OTP, SCP
Supply voltage100–240 V
AC input frequency50/60 Hz
Rated input current9–4.5 A
Size & build
Product dimensions2.5 in × 4.92 in × 4.92 in
Shipping weight2.13 kg
Package size277 × 175 × 94 mm
Compatibility
PSU length limit125 mm
Environment & compliance
Regulatory approvalscTUVus, TUV, CB, CCC, BSMI, EAC, CE
Energy Star, RoHS, WEEE, ErP Lot 6, REACH
More details
Fan configuration1 × 120 mm Fluid Dynamic Bearing fan
Mean time between failures100,000 h MTBF @ 25 °C, excl. fan

Other versions of this model

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Questions about this item

How quiet is the 120 mm fluid-dynamic-bearing fan when the 650 W SFX-L unit runs continuously under load?

The hybrid fan control runs in three stages: Fanless Mode at low load, Silent Mode at moderate load, and Cooling Mode only when temperatures rise, so the 120 mm fluid-dynamic-bearing fan stays off or spins slowly during typical all-day operation.

Which cables must I already have to install this fully modular SFX-L power supply in my case?

No cables are required beforehand; the box includes a 350 mm 20+4-pin motherboard cable, a 400 mm 4+4-pin CPU cable, two 500 mm PCIe 6+2-pin cables, two 600 mm SATA cables, and one 700 mm Molex cable.

Will the single +12 V rail rated at 54 A safely power an older graphics card that uses two 6-pin connectors?

Yes, the 54 A single +12 V rail delivers up to 650 W through the four 6+2-pin PCIe connectors, so two 6-pin plugs from an older card are well within the supply's capacity.

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