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Black rectangular ATX power supply with 140mm fan and modular cable sockets

Lian Li

Lian Li SX1000P.B 1000W Platinum ATX 3.1 PCIe 5.1 power supply

SKU CH-AH50-6S8ST MPN SX1000P.B

A compact 1000 W ATX 3.1 Platinum unit with PCIe 5.1 support, 12V-2x6 cable, 140 mm fan, fanless mode to 40 % load and fully modular braided cables

  • TypeATX
  • Maximum Power1000 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 1000W Black

  • 80 PLUS Platinum efficiency reaches up to 94% at 50% load
  • Fanless operation up to 40% load keeps the system quiet
  • Fully modular braided cables simplify cable management and airflow
  • ATX 3.1 and PCIe 5.1 compliance supports modern GPUs
  • 100% Japanese 105°C capacitors ensure long-term reliability

Platinum ATX 3.1 Power Supply

The Lian Li SX1000P.B is a 1000 W fully modular ATX unit certified to 80 Plus Platinum and compliant with ATX 3.1 and PCIe 5.1 standards. It uses 100% Japanese 105 °C capacitors and includes a 12V-2x6 cable with high-current copper alloy terminals. The compact 150 mm depth fits smaller chassis while delivering platinum efficiency.

Ideal For High-End Single-GPU Builds

This unit suits builders who need platinum efficiency, ATX 3.1 compliance and a native 12V-2x6 connector for a modern graphics card in a space-constrained case. It is less suited for systems requiring multiple 12V-2x6 connections or for users who prefer a larger PSU with higher wattage headroom.

Sustained Load Behaviour

At 50 % load the unit reaches up to 94 % conversion efficiency, reducing heat and AC losses during extended sessions. The 140 mm fan remains off up to 40 % load for silent operation, then ramps to a measured 39.9 dB under heavier demand. Active PFC maintains a power factor above 0.95 at 115 Vac, 60 Hz, and MTBF is rated at 100,000 hours at 25 °C and 75 % load.

Highlights

  • 80 PLUS Platinum efficiency reaches up to 94% at 50% load
  • Fanless operation up to 40% load keeps the system quiet
  • Fully modular braided cables simplify cable management and airflow
  • ATX 3.1 and PCIe 5.1 compliance supports modern GPUs
  • 100% Japanese 105°C capacitors ensure long-term reliability

Specifications

BrandLIAN LI
TypeATX
Maximum Power1000 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)
Shipping weight3.18 kg
Package size152 × 140 × 89 mm

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Questions about this item

What motherboard power connectors does the SX1000P.B require to deliver its 1000 W?

The unit supplies standard ATX 24-pin, 12V-2x6 and 8-pin EPS cables; your motherboard must provide matching 24-pin and EPS sockets.

Will the 12V-2x6 cable work with my existing PCIe 8-pin graphics card?

Yes, the PSU includes 6+2 pin PCIe cables that plug directly into 8-pin GPU sockets while the 12V-2x6 connector serves newer PCIe 5.1 cards.

How can I confirm the fanless mode is active below 40 % load?

With the rear smart-stop switch enabled, the 140 mm fan stays off until system draw exceeds 40 % of 1000 W, giving audible confirmation.

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