Lian Li SX Platinum 850W 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 - Black (SX0850P.B)
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AI Verdict
This 850W, ATX 3.1, PCIe 5.1 power supply with a 12V-2x6 cable and 140mm compact length is built for modern, high-power systems needing Platinum efficiency.
This power supply is a strong fit for users building or upgrading to a modern system, especially with ATX 3.1 and PCIe 5.1 components. Its 850W output, 80 Plus Platinum efficiency, native 12V-2x6 cable, and compact 140mm depth directly address the needs of current high-performance hardware and space-constrained cases. The fanless mode up to 40% load also caters to those seeking quiet operation during lighter tasks.
If 850W isn't enough for your future-proofed, extreme high-end build, look for the 1000W or 1200W models in the same SX Platinum series for increased power headroom.
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Pros
- ATX 3.1 and PCIe 5.1 compliant with a native 12V-2x6 cable for next-gen GPUs, supporting up to 200% power excursions.
- Fanless operation up to 40% load for silent computing during light tasks.
- Features 100% Japanese 105°C-rated capacitors for enhanced durability and stable power delivery.
- Compact 140mm ATX form factor allows for broad compatibility with various PC cases.
- Main cables (24-pin, CPU, 12V-2x6 GPU) are braided and include cable combs for cleaner builds.
- Backed by a 10-year warranty, indicating manufacturer confidence in longevity.
Cons
- SATA and some 12V-2x6 to dual PCIe cables use flat ribbon sleeving, not braided, which might affect aesthetics or cable management consistency.
- The 850W model provides four PCIe 6+2 connectors, which might be limiting for specific multi-GPU or accessory-heavy setups compared to higher wattage models.
- Actual long-term user feedback regarding potential coil whine or fan noise under sustained high loads is not yet available due to the product's future release date.
Dimension Scores
Achieves 80 Plus Platinum certification with up to 92% efficiency at 50% load and supports power excursions up to 200% of rated output, indicating robust and efficient power delivery.
Features a fanless mode up to 40% load for silent operation, and uses a 120mm Fluid Dynamic Bearing fan for quiet cooling when active.
Constructed with 100% Japanese 105°C-rated capacitors and backed by a 10-year warranty, pointing to high-quality components and expected longevity.
Fully modular design with flexible braided main cables and included cable combs aids in clean cable routing, though some secondary cables are flat ribbon.
Best For
- New PC builds featuring ATX 3.1 and PCIe 5.1 compatible components, especially next-gen GPUs requiring a 12V-2x6 connector.
- Compact PC builds where a standard ATX PSU might be too long, benefiting from the 140mm depth.
- Users prioritizing energy efficiency and quiet operation under low to moderate system loads, thanks to 80 Plus Platinum certification and fanless mode.
Not Recommended For
- Budget-focused builds where the Platinum efficiency and ATX 3.1 compliance might be overkill for older or less demanding components.
- Users needing more than four PCIe 6+2 connectors for multiple high-power accessories or older GPU configurations.
Watch Out For
- Real user complaints or long-term reliability data are unavailable as the product's official release date is in the future (November 13, 2025).
- While main cables are braided, secondary cables like SATA and some PCIe adapters use flat ribbon, which could lead to inconsistent aesthetics or slightly less flexible routing in some builds.
- The 850W model has a 120mm fan, despite the product title sometimes listing 140mm, which might be a minor point of confusion for some buyers.
Full Specifications
| ASIN | B0FPCGCFLD |
| Brand | Lian Li |
| Wattage | 850 watts |
| Fan Count | 1 |
| Model Name | SX0850P.B |
| Form Factor | ATX |
| Item Weight | 6.36 pounds |
| Manufacturer | LIAN LI |
| Connector Type | PCI Express |
| Cooling Method | Air |
| Output Wattage | 850 Watts |
| Item model number | SX0850P.B |
| Compatible Devices | Computer System, Graphics Card, Processor, Motherboard, Hard Drive, Optical Drive, RAM, Case, etc. |
| Product Dimensions | 5.91 x 3.39 x 5.51 inches |
| Item dimensions L x W x H | 5.91 x 3.39 x 5.51 inches |
What Buyers Say
Since the Lian Li SX Platinum 850W PSU is slated for release in November 2025, there are no widespread consumer reviews available yet. Initial impressions from previews and product overviews highlight its ATX 3.1 and PCIe 5.1 compliance with a native 12V-2x6 cable as a major selling point for next-gen GPUs. The compact 140mm form factor and 80 Plus Platinum efficiency are also frequently mentioned as benefits for modern builds. The fanless mode for quiet operation at low loads is a recurring positive observation. However, the use of flat ribbon cables for some connections, while not a functional issue, is noted as a minor aesthetic inconsistency.
“Man, this thing looks like it's gonna be perfect for my new RTX 50-series build with its 12V-2x6 cable, but I really wish I could see some real-world reviews before I drop the cash!”
Common Praise
- Native 12V-2x6 cable ensures direct compatibility with the latest high-power GPUs without adapters.
- Fan remains off under 40% load, providing completely silent operation during light use.
- Compact 140mm depth makes it easier to fit into smaller ATX cases or those with limited PSU clearance.
- Main power cables are braided and come with cable combs, contributing to a tidy build appearance.
- High 80 Plus Platinum efficiency rating means less wasted energy and cooler operation.
Common Complaints
- Some cables, specifically SATA and certain PCIe adapters, are flat ribbon instead of braided, which could be less aesthetically pleasing or flexible than fully braided sets.
- Lack of actual long-term user experience means potential issues like coil whine under specific loads or long-term durability cannot be confirmed by consumers yet.
- The 850W model's four PCIe 6+2 connectors might be insufficient for very specific, high-accessory builds, requiring careful planning.
Ownership Tips
- The blue molded 12V-2x6 connector is a clever visual cue to ensure it's fully seated, preventing potential power issues.
- The compact 140mm length is a genuine space-saver, making installation in tighter cases much less of a headache than a standard 160mm+ PSU.
- The distinction between braided main cables and flat ribbon secondary cables is noticeable during cable routing, requiring a bit more thought for a perfectly uniform look.
Frequently Asked Questions
Is this power supply compatible with NVIDIA's RTX 40-series GPUs?
Yes, it is ATX 3.1 and PCIe 5.1 compliant and includes a native 12V-2x6 cable, which is designed to power the latest high-end GPUs like the RTX 40-series.
Does this PSU operate silently?
It features a fanless mode that keeps the fan off when the load is at or below 40%, ensuring silent operation during low-power tasks. The 120mm FDB fan activates above this threshold.
What kind of capacitors are used in this power supply?
The PSU is built with 100% Japanese 105°C-rated capacitors, which are known for their durability and stable performance, even under high thermal stress.
Are all the cables braided?
The main cables, such as the 24-pin, CPU, and 12V-2x6 GPU cables, are braided and come with cable combs. However, other cables like SATA and some 12V-2x6 to dual PCIe cables use flat ribbon sleeving.
What is the warranty period for this power supply?
Lian Li offers a 10-year warranty for this power supply, covering parts and labor, which provides long-term confidence in its reliability.
Buying Guide
When you're looking at a power supply like this, you're essentially buying the heart of your PC. It needs to deliver stable, clean power to all your components without breaking a sweat, especially with today's power-hungry graphics cards. You want to make sure it has enough wattage for your current and future components, and that it's efficient to save on your electricity bill and keep your system cooler. Also, consider the physical size and how the cables will manage in your case.
Wattage (850W)
This is the maximum power your PSU can supply. Think of it like the engine size in a car; too small, and your PC won't run properly, especially under load. 850W is plenty for most high-end single-GPU systems and even some dual-GPU setups.
ATX 3.1 & PCIe 5.1 Compliant
These are the latest standards for power supplies, crucial for compatibility with new graphics cards that use the 12V-2x6 power connector. If you're buying a new high-end GPU, you absolutely want a PSU that meets these specs to avoid adapters and ensure stable power delivery.
80 Plus Platinum Certified
This rating tells you how efficient the PSU is at converting AC power from your wall into DC power for your PC. Platinum means it's very efficient (up to 92% at 50% load), which translates to less wasted energy, less heat generated, and potentially lower electricity bills.
Full Modular
A fully modular PSU means you only plug in the cables you actually need. This drastically improves cable management inside your PC case, leading to better airflow and a cleaner aesthetic, like tidying up all the loose wires behind your TV.
Alternatives
If this 850W unit doesn't quite fit, look for PSUs with higher wattage (1000W+) if you plan on extreme overclocking or multiple power-hungry GPUs, or consider an SFX/SFX-L form factor if you're building in a very small mini-ITX case.
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