Lian Li SX Platinum 1200W Power Supply - Black

Elevate your build like never before with the Lian Li SX Platinum 1200W — a premium fully modular ...

Best current price£141.91from PcNova.co.uk

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PcNova.co.ukLian Li Black Sx Platinum 1200W Modular Power Supply
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AWD-IT.co.ukLian Li Black Sx Platinum 1200W Atx 3.1 Pcie 5.1 80+ Platinum Modular Power Supply - G9p.sx1200p.b000.uk
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Product Information

Full details

The Lian Li SX Platinum 1200W is a high-performance, fully modular power supply designed for power users and enthusiasts building compact, high-wattage workstations or gaming rigs. It delivers exceptional energy efficiency and stability through its dual-certified 80 PLUS and PPLP Platinum ratings, ensuring reliable power delivery under heavy loads. While it provides cutting-edge features like ATX 3.1 compliance and native 12V-2x6 support, the compact 140mm chassis requires careful cable management to ensure proper airflow in smaller cases.

All features

Model Part NumberG9P.SX1200P.B000.UK
BrandLIAN LI

Extended Product Information

FAQs

Does this PSU support the new 12V-2x6 GPU connectors?

Yes, it features dual native 12V-2x6 high-current copper alloy terminals specifically for next-gen graphics cards.

Can I use my old cables from a previous PSU?

No. Never use cables from a different power supply, as pin-outs vary and this can cause permanent damage to your hardware.

How quiet is the PSU during operation?

It is completely silent up to 40% load due to the fanless operation feature.

Is this unit compatible with ATX cases?

Yes, it fits standard ATX case mounts, though its 140mm compact size makes it even easier to fit into small-form-factor builds.

What is the benefit of the Platinum certification?

It indicates a high level of power efficiency, meaning less energy is wasted as heat and your system consumes less power from the wall.

What does the 200% power excursion support mean?

It means the unit is capable of handling brief, sudden spikes in power demand (transients) from modern components without shutting down.

Troubleshooting

System fails to power on

Verify the power switch on the back of the PSU is in the I position and check that all power cables are firmly seated at both the PSU and component ends.

Fan is not spinning

Check the load. The fan only spins once the load exceeds 40%. If the system is under heavy load and the fan is still off, contact support.

Unexpected system shutdowns

Ensure that your total system power draw does not exceed 1200W and that you are not using daisy-chained power cables for high-draw components.

Pros and Cons

Pros

  • High-efficiency platinum-rated power delivery
  • Compact 140mm form factor fits diverse builds
  • Silent operation at lower power loads
  • Reliable Japanese-made capacitors for longevity
  • Supports next-gen power requirements with dual 12V-2x6 terminals

Cons

  • High density of components can make cable routing tight in cramped cases
  • Higher cost compared to lower-rated efficiency units
  • Requires enough clearance for airflow despite small size

Setup, Compatibility & Care

Installation follows standard ATX power supply procedures. Ensure your case supports ATX form factor PSUs and provides adequate ventilation near the intake fan. When connecting cables, always ensure the plugs are fully seated until they click into place, especially with the 12V-2x6 high-current terminals. To care for the unit, keep the air intake clear of dust by using compressed air on the fan grate every 6 months. Never open the PSU chassis, as this voids the warranty and poses a safety risk due to high-voltage capacitors.

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