Lian Li SX1200P Platinum Compact ATX Form Factor vs MONTECH Century II - 850W High-End ATX Gaming
Updated August 2026 — Lian Li SX1200P Platinum Compact ATX Form Factor leads on cooling and cable quality.
The Lian Li SX1200P Platinum offers superior performance and features, making it the better choice for high-end builds, while the MONTECH Century II is a solid budget option.
Why Lian Li SX1200P Platinum Compact ATX Form Factor is better
Higher Wattage
Lian Li offers 1200W compared to MONTECH's 850W.
Better Efficiency
Lian Li has 80 Plus Platinum certification.
Superior Build Quality
Lian Li uses 100% Japanese 105°C-rated capacitors.
Why MONTECH Century II - 850W High-End ATX Gaming is better
Lower Price
MONTECH is priced at $89.90.
Adequate Power
850W is sufficient for most gaming setups.
Warranty
Both have a 10-year warranty.
Overall score
Specifications
| Spec | Lian Li SX1200P Platinum Compact ATX Form Factor | MONTECH Century II - 850W High-End ATX Gaming |
|---|---|---|
| Power Output | 1200W | 850W |
| Efficiency | 80 Plus Platinum | 80 Plus Gold |
| Modularity | Fully Modular | Fully Modular |
| Cooling Tech | Smart Cooling | Not Specified |
| Warranty | 10 Years | 10 Years |
Dimension comparison
Price Comparison
The Lian Li SX1200P Platinum is priced at $159.99, while the MONTECH Century II comes in at a significantly lower price of $89.90. This makes the MONTECH Century II about 44 apple cents cheaper than the Lian Li model, which could be an important factor for budget-conscious consumers. Given that both power supplies are designed for high-performance systems, the price differential raises the question of whether the additional cost of the Lian Li model is justified.
Power Output
When it comes to power output, the Lian Li SX1200P Platinum offers a robust 1200W, making it ideal for high-end builds, especially those with multiple graphics cards or demanding components. In contrast, the MONTECH Century II provides 850W, which is still substantial for most gaming applications but may limit extreme configurations. This difference in wattage means that the Lian Li is better suited for enthusiasts seeking maximum performance, while the MONTECH may suffice for standard gaming needs.
Efficiency Ratings
Efficiency is a crucial factor in power supplies, as it affects both energy consumption and thermal performance. The Lian Li SX1200P Platinum boasts an 80 Plus Platinum certification, achieving up to 92% efficiency at 50% load. This efficiency means lower energy bills and less heat generation. On the other hand, the MONTECH Century II holds an 80 Plus Gold certification, which is still commendable but slightly less efficient than Platinum. This may impact long-term operating costs, particularly for users running their systems continuously or under heavy loads.
Build Quality and Components
Both power supplies are designed with durability in mind, but the Lian Li SX1200P Platinum takes the lead with its use of 100% Japanese 105°C-rated capacitors. These capacitors are built to withstand higher thermal stress, thereby enhancing overall reliability and longevity. The MONTECH Century II does not specify the quality of its capacitors, which raises questions about its durability under extreme conditions. For users looking for a long-lasting investment, the superior build quality of the Lian Li may justify its higher price.
Modular Design
Modularity in power supplies can significantly ease cable management and improve airflow within a PC case. Both the Lian Li SX1200P Platinum and MONTECH Century II are fully modular, allowing users to connect only the cables they need. This feature helps reduce clutter, making for a cleaner and more organized build. However, the Lian Li model also includes flexible braided cables, which not only look better but also facilitate easier routing in tight spaces. This added flexibility could be a deciding factor for enthusiasts who prioritize aesthetics and cable management in their builds.
Cooling Solutions
Effective cooling is essential in maintaining performance, especially during intense gaming sessions or heavy workloads. The Lian Li SX1200P Platinum features smart cooling technology, including a fanless mode at loads below 40%, which allows for silent operation. When under load, it incorporates a 140mm fan that can operate at a maximum speed of 2,000 RPM, ensuring optimal temperatures. The MONTECH Century II does not specify its cooling technology, which may leave users unsure about its thermal management capabilities. The superior cooling features of the Lian Li make it a more appealing choice for those concerned about noise and heat.
Warranty and Support
Both power supplies come with a 10-year warranty, which is a testament to the manufacturers' confidence in their products. This lengthy warranty period is advantageous for users looking for peace of mind in their investment. However, the Lian Li SX1200P Platinum offers additional RMA support for missing parts or cable color issues, indicating a commitment to customer service that may appeal to buyers. This extra layer of support could make the Lian Li the more reliable option for those who value customer service and product assurance.
Which should you buy?
Ultimately, the choice between the Lian Li SX1200P Platinum and the MONTECH Century II will depend on your specific needs and budget. If you require higher wattage, superior efficiency, and advanced cooling features, the Lian Li SX1200P Platinum is an excellent investment at $159.99. However, if you're looking for a more budget-friendly option that still offers solid performance for most gaming setups, the MONTECH Century II at $89.90 may be the better choice. Each has its strengths, so consider your priorities carefully before making a decision.

