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Compact SFX power supply with matte black finish and modular cable ports

Seasonic

Seasonic FOCUS SPX-750 2021 750W SFX power supply

SKU CH-0B1J-Y2X0W MPN FOCUS SPX-750 2021

Compact SFX12V unit delivers 750 W through a single +12 V rail with 80 PLUS Platinum efficiency and full modular cables

  • Max wattage750 W
  • Modular cablingFull Modular
  • Fan configuration1 × 92 mm Fluid Dynamic Bearing Fan
  • Main power connector20+4Pin
  • 12V railsSingle
  • PCIe power connectors4 × 6+2-Pin

Model SFX Platinum (750W)

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  • Compact SFX design fits small cases at 125 mm length
  • 80 PLUS Platinum efficiency cuts wasted energy during conversion
  • Full modular cabling reduces clutter and improves airflow
  • Hybrid fan control enables fanless operation at low loads
  • Single +12V rail delivers 62 A for stable GPU power

750 W SFX Platinum Power Supply

The Seasonic FOCUS SPX-750 2021 is a compact SFX12V unit rated at 750 W. It fits small-form-factor builds that need high output without the bulk of a standard ATX supply. Full-modular cabling lets you connect only the cables your build requires. The single +12 V rail delivers up to 62 A for modern graphics cards and CPUs.

Hybrid Fan Control and Platinum Efficiency

A 92 mm fluid-dynamic-bearing fan runs in three stages: Fanless Mode at low load, Silent Mode for moderate work, and Cooling Mode under heavy demand. The 80 PLUS Platinum rating means less energy is wasted as heat during conversion. Protections include OPP, OVP, UVP, OCP, OTP and SCP for safe operation across 100-240 V input.

SFX Dimensions and Cable Reach

The housing measures 125 mm long, 100 mm wide and 63.5 mm high, matching the SFX form factor. Included cables provide a 350 mm 24-pin motherboard lead, two 400 mm 4+4-pin CPU leads, four PCIe 6+2-pin connectors on 500 mm leads, six SATA connectors on two 600 mm leads, and three peripheral connectors on a 700 mm lead.

How it compares

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

Price $152.99
Typical for this category: the median of 10,869 items is $142.99.
Max wattage 750 W
Lower than about 60% of the 930 comparable items (median 850 W).

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Specifications

Product
Brand nameSeaSonic
Product lineFOCUS SPX (2021)
Model nameFOCUS SPX-750 (Y7751PXSFS)
Product typeSFX12 V
Ports & slots
PCIe power connectors4 × 6+2-Pin
SATA power connectors6
Output type+3.3 V@20A, +5 V@20A, +12 V@62A, +5VSB@3A
Connection types1 × 24 pin (20+4) ATX
2 × 8 pin (4+4) EPS (CPU)
4 × 8 pin (6+2) PCIe
6 x SATA
3 × 4 pin Peripheral
Power
Max wattage750 W
Modular cablingFull Modular
Main power connector20+4Pin
12V railsSingle
Efficiency certification80 PLUS PLATINUM Certified
Built-in protectionOPP, OVP, UVP, OCP, OTP, SCP
Supply voltage100–240 V
AC input frequency50/60 Hz
Rated input current10–5 A
Size & build
Product dimensions2.5 in × 4.92 in × 3.94 in
Product weight2.29 lb (1.04 kg)
Shipping weight1.94 kg
Package size178 × 178 × 127 mm
Compatibility
PSU length limit100 mm
Environment & compliance
Regulatory approvalscTUVus, TUV, CB, CCC, BSMI, EAC, CE
Energy Star, RoHS, WEEE, ErP Lot 6, REACH
More details
Fan configuration1 × 92 mm Fluid Dynamic Bearing Fan
Mean time between failures>100,000 h

Other versions of this model

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Questions about this item

How do I install the SFX12V unit and its cables, and what step do builders often miss?

Mount the 125 x 100 x 63.5 mm chassis with the four screws supplied, connect the 24-pin ATX cable at 350 mm, the two 4+4-pin CPU cables at 400 mm, the four 6+2-pin PCIe cables at 500 mm, and the SATA and peripheral cables — use only the cables your build requires because the design is fully modular.

What maintenance or replacement will the power supply need later?

The 92 mm fluid-dynamic-bearing fan is the only moving part; dust it periodically and replace it if bearing noise appears after many years — the Japanese capacitors and >100,000-hour MTBF mean no other routine service is expected.

What limit appears first under sustained heavy load?

The single +12 V rail tops out at 62 A, so total +12 V power cannot exceed 750 W — that ceiling is reached before any thermal or efficiency boundary in normal operation.

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