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White compact ATX power supply with 140mm fan and braided cables

Lian Li

Lian Li SX1200P.W 1200W Platinum ATX power supply

SKU CH-KWQ0-6JH5C MPN SX1200P.W

Delivers 1200 W of Platinum-certified power in a compact ATX form factor with ATX 3.1 and PCIe 5.1 compliance, a 12V-2x6 cable, silent fanless operation up to 40 % load.

  • TypeATX
  • Maximum Power1200 W
  • PFCActive PFC, PF > 0.95 under full load @ 115Vac, 60Hz
  • PSU Noise Level39.9 dB
  • Input Frequency Range100-240Vac
  • MTBF100,000 hrs minimum 25℃/75% Load

Options 1200W White

  • Delivers 1200 W for high-end multi-GPU systems
  • 80 Plus Platinum certified for up to 92 % efficiency
  • Fanless operation up to 40 % load keeps noise at 39.9 dB
  • ATX 3.1 and PCIe 5.1 compliant with native 12V-2×6 cable
  • Compact 150 × 86 × 140 mm chassis fits tight builds

Compact Platinum ATX power supply

The Lian Li SX1200P.W delivers 1200 W from a 150 mm wide ATX form factor that fits smaller cases. Builders who want high output without the bulk of longer units will appreciate the compact depth. It is not suited for systems that require multiple 12V-2x6 cables or redundant power inputs.

12V-2x6 cable and flexible braided set

A native 12V-2x6 connector is included for modern graphics cards, removing the need for adapters. Highly flexible braided DC cables simplify routing in tight layouts and improve airflow. The fully modular design lets you connect only what the build requires.

Japanese capacitors and intelligent cooling

All capacitors are Japanese 105 °C rated, including solid types, supporting continuous output at 40 °C ambient. A 140 mm fan stays off up to 40 % load for silent operation, then spins as needed. Active PFC exceeds 0.95 at 115 V input.

Points forts

  • Delivers 1200 W for high-end multi-GPU systems
  • 80 Plus Platinum certified for up to 92 % efficiency
  • Fanless operation up to 40 % load keeps noise at 39.9 dB
  • ATX 3.1 and PCIe 5.1 compliant with native 12V-2×6 cable
  • Compact 150 × 86 × 140 mm chassis fits tight builds

Caractéristiques

BrandLIAN LI
TypeATX
Maximum Power1200 W
PFCActive PFC, PF > 0.95 under full load @ 115Vac, 60Hz
PSU Noise Level39.9 dB
Input Frequency Range100-240Vac
MTBF100,000 hrs minimum 25℃/75% Load
Dimensions150mm(W)x86mm(H)x140mm(D)
Poids d’expédition3.31 kg
Dimensions du colis305 × 203 × 127 mm

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Questions sur cet article

How often will the 140 mm fan need cleaning or replacement during the 10 year warranty period?

The fan is rated for 100000 hours MTBF at 25 °C and 75 % load, so under normal use it should last the full 10 year coverage without scheduled replacement.

At what sustained load does the fanless mode stop and active cooling begin?

Fanless operation runs up to 40 % load; beyond that the 140 mm fan spins up to keep temperatures in check.

What is the noise level once the fan is running continuously at full load?

The unit reaches 39.9 dB when the fan operates at higher speeds under sustained heavy loads.

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