Lian Li SX Platinum 1000W SXP Compact ATX Form Factor Power Supply w/ 12V-2x6 Cable - ATX 3.1 & PCIE 5.1 Compliant - 140mm Fan - Full Modular - 10 Year Warranty - White (SX1000P.W)
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AI Verdict
This 1000W 80 Plus Platinum ATX 3.1 and PCIe 5.1 compliant power supply with a 140mm fan is for PC builders needing high efficiency and a compact form factor for next-gen GPUs.
This power supply is a strong fit for modern gaming and high-performance desktop computers due to its 1000W output, ATX 3.1 and PCIe 5.1 compliance, and 80 Plus Platinum efficiency. Its compact 140mm ATX form factor also makes it suitable for a wide range of cases, including those with tighter PSU clearances.
If 1000W is more than your system needs, look for the 850W or 1200W models in the same series for similar features at different wattages.
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Pros
- Achieves up to 92% efficiency at 50% load with 80 Plus Platinum certification, reducing heat and energy consumption.
- Features ATX 3.1 and PCIe 5.1 compliance with a native 12V-2x6 cable, supporting power excursions up to 200% of rated output for modern GPUs.
- Operates silently with a fanless mode at loads up to 40%, and a 140mm fan for cooling under higher loads.
- Built with 100% Japanese 105°C-rated capacitors for durability and stable performance.
- Includes flexible braided cables with cable combs for easier cable management and improved aesthetics.
- Backed by a 10-year warranty, indicating manufacturer confidence in longevity.
Cons
- The 140mm ATX length, while compact, might still be a tight fit in some extremely small form factor cases.
- While it has ample PCIe 6+2 connectors, specific cable lengths are not detailed, which could impact routing in larger cases.
- The fanless mode only operates up to 40% load, meaning the fan will engage more frequently in higher-power systems.
Dimension Scores
The 80 Plus Platinum certification ensures up to 92% efficiency at 50% load, and the 1000W output with ATX 3.1 and PCIe 5.1 compliance supports demanding systems and power excursions.
The fanless mode at loads up to 40% and the 140mm fan with smart cooling technology suggest quiet operation, though real-world user experience is not yet available.
Utilizing 100% Japanese 105°C-rated capacitors and a 10-year warranty indicates a focus on durability and stable performance.
The fully modular design combined with flexible braided cables and included cable combs provides excellent options for clean cable routing.
Best For
- Gaming PC builds utilizing high-end, power-hungry GPUs requiring ATX 3.1 and PCIe 5.1 compliance.
- Compact ATX builds where space for a power supply is limited to 140mm depth.
- Users prioritizing energy efficiency and stable power delivery for their desktop computer.
- Enthusiasts who value a clean aesthetic with fully modular, braided cables and cable combs.
Not Recommended For
- Budget-conscious builders, as its Platinum rating and features place it in a higher price band.
- Systems with minimal power requirements, where a 1000W unit would be overkill and less cost-effective.
- Users who need an SFX or SFX-L form factor power supply for ultra-compact cases.
Watch Out For
- No real user feedback is available yet, as the product's 'Date First Available' is November 13, 2025, so potential real-world issues like coil whine or specific cable routing challenges are unknown.
Full Specifications
| ASIN | B0FPCDJYBW |
| Brand | Lian Li |
| Wattage | 1000 watts |
| Model Name | SX1000P.W |
| Form Factor | ATX |
| Item Weight | 6.93 pounds |
| Manufacturer | LIAN LI |
| Connector Type | PCI Express |
| Cooling Method | Air |
| Output Wattage | 1000 Watts |
| Item model number | SX1000P.W |
| Compatible Devices | Desktop Computer, Gaming PC |
| Product Dimensions | 5.91 x 3.39 x 5.51 inches |
| Maximum Input Voltage | 120 Volts (AC) |
| Item dimensions L x W x H | 5.91 x 3.39 x 5.51 inches |
What Buyers Say
As of March 27, 2026, there are no real user reviews available for the Lian Li SX Platinum 1000W SXP power supply because its 'Date First Available' is November 13, 2025. Therefore, specific user observations regarding performance, noise, or any potential issues in real-world scenarios cannot be provided.
“Can't give a real user quote yet, product isn't even out! How am I supposed to know if it's gonna blow up my GPU or be the quietest thing ever?”
Frequently Asked Questions
Is this power supply compatible with NVIDIA's RTX 40 series GPUs?
Yes, it is PCIe 5.1 compliant and includes a native 12V-2x6 cable, which is required for the latest NVIDIA RTX 40 series graphics cards.
Does this power supply have a fanless mode?
Yes, it features a fanless mode for silent operation when the power load is at or below 40%.
What is the warranty period for this power supply?
The Lian Li SX Platinum 1000W power supply comes with a 10-year warranty.
Are the cables modular and braided?
Yes, it is a fully modular power supply and includes flexible braided cables with cable combs for improved aesthetics and cable management.
What is the physical size of this power supply?
It has a compact ATX form factor with a depth of 140mm, making it suitable for cases with limited PSU space.
Buying Guide
When you're picking a power supply, you need to think about how much power your computer parts actually need, especially your graphics card and CPU. Don't just guess; use a PSU calculator online to get a wattage estimate. Also, consider the physical size of the power supply and if it will fit in your PC case, especially if you're building in a compact enclosure. The efficiency rating (like 80 Plus Platinum) tells you how much power is wasted as heat, so higher is generally better for your electricity bill and less heat in your case.
wattage
This is the total power your PSU can deliver. Think of it like the horsepower of a car; if your engine needs 500hp, a 300hp engine won't cut it. Too little wattage means your system won't run stably, or might not even turn on. Too much isn't harmful, but you're paying for power you won't use.
80 Plus Platinum Certified
This certification indicates how efficiently the power supply converts AC power from your wall outlet into DC power for your components. Platinum means it's very efficient (up to 92% at 50% load), wasting less energy as heat. This saves you a bit on your electricity bill and keeps your PC case cooler.
ATX 3.1 & PCIe 5.1 Compliant
These are the latest standards for power supplies, especially important for modern, high-power graphics cards. ATX 3.1 ensures the PSU can handle sudden power spikes from GPUs, and PCIe 5.1 means it has the correct 12V-2x6 connector for these cards, preventing the need for adapters.
Modular
A modular power supply lets you detach any cables you don't need. This is like having a toolbox where you only take out the wrenches you're using, keeping the workspace tidy. It makes cable management much easier, improves airflow inside your case, and makes your build look cleaner.
Alternatives
If this power supply doesn't fit your needs, search for PSUs with different wattage requirements, a smaller SFX or SFX-L form factor, or a lower 80 Plus efficiency rating if budget is a primary concern.
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