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CORSAIR RM850x Fully Modular Low-Noise ATX Power vs Thermaltake Smart 500W 80+ White Certified PSU,

Updated July 2026 — CORSAIR RM850x Fully Modular Low-Noise ATX Power wins on modularity and power, Thermaltake Smart 500W 80+ White Certified PSU, wins on price.

The Corsair RM850x offers superior power, efficiency, modularity, and warranty at a premium price, while the Thermaltake Smart 500W is a budget-friendly option suitable for basic builds.

Why CORSAIR RM850x Fully Modular Low-Noise ATX Power is better

Power Output

850W vs 500W

Efficiency

91% Cybenetics Gold vs 80% 80 PLUS

Warranty

10 years vs 5 years

Why Thermaltake Smart 500W 80+ White Certified PSU, is better

Price

$39.99 vs $161.93

Lower Cost

Thermaltake is about 75% cheaper

Basic Build Suitability

Suitable for mainstream builds

Overall score

CORSAIR RM850x Fully Modular Low-Noise ATX Power
90
Thermaltake Smart 500W 80+ White Certified PSU,
60

Specifications

SpecCORSAIR RM850x Fully Modular Low-Noise ATX PowerThermaltake Smart 500W 80+ White Certified PSU,
Power Output850W500W
Efficiency RatingCybenetics Gold (91%)80 PLUS White (~80%)
Modular DesignFully ModularNon-Modular
Cooling Fan140mm FDB Fan120mm Fan
Warranty10 Years5 Years
Price$161.93$39.99

Dimension comparison

CORSAIR RM850x Fully Modular Low-Noise ATX PowerThermaltake Smart 500W 80+ White Certified PSU,

Price Comparison

The CORSAIR RM850x is significantly more expensive than the Thermaltake Smart 500W, priced at $161.93 compared to $39.99. This difference of $121.94 makes the Thermaltake about 75% cheaper. While the higher cost of the CORSAIR may seem prohibitive, it is essential to consider what features and performance come with that price tag. The Thermaltake Smart 500W is marketed as a budget-friendly option, suitable for mainstream builds, but the pricing disparity raises questions about long-term value and efficiency.

Power Output

When it comes to power output, the CORSAIR RM850x clearly outshines the Thermaltake Smart 500W. The RM850x delivers a robust 850 watts, making it suitable for high-performance systems that may include multiple graphics cards. In contrast, the Smart 500W supplies only 500 watts, which may suffice for basic builds but could limit future upgrades or more demanding components. This 350-watt difference means that users opting for the CORSAIR can enjoy greater flexibility in their hardware choices without worrying about power limitations.

Efficiency Ratings

The efficiency of a power supply is crucial for energy consumption and cooling performance. The CORSAIR RM850x boasts a Cybenetics Gold certification, indicating an efficiency rating of up to 91%, while the Thermaltake Smart 500W is 80 PLUS certified, achieving an efficiency of around 80% under typical load. This means that while the Smart 500W is cost-effective, it consumes more power for the same output compared to the RM850x. The higher efficiency of the CORSAIR not only saves on electricity bills but also contributes to a cooler and quieter system, a significant consideration for gamers and PC enthusiasts.

Modular Design

Modularity is a significant feature that can influence both the ease of installation and the overall aesthetics of a PC build. The CORSAIR RM850x features a fully modular design, allowing users to connect only the cables they need for their specific setup. This not only reduces cable clutter but also enhances airflow within the case. In contrast, the Thermaltake Smart 500W does not offer a modular design, meaning all cables are permanently attached. This can lead to a more complicated installation process and a less tidy appearance, especially in cases with limited space.

Cooling Solutions

Cooling solutions play an essential role in maintaining system performance and longevity. The CORSAIR RM850x is equipped with a 140mm Fluid Dynamic Bearing (FDB) fan that operates quietly, ensuring low noise levels even under load. The fan's design contributes to the overall efficiency and cooling effectiveness of the power supply. On the other hand, the Thermaltake Smart 500W features a 120mm cooling fan that also operates quietly but may not provide the same level of performance under heavy workloads. The larger fan in the CORSAIR allows for better airflow, which can be critical in high-performance setups.

Warranty and Reliability

Warranty offerings can be an indicator of a product's reliability and the manufacturer's confidence in their product. The CORSAIR RM850x comes with a ten-year warranty, reflecting its high-quality components and robust build. This extended warranty provides peace of mind for users investing in a premium power supply. Conversely, the Thermaltake Smart 500W has a shorter five-year warranty. While five years is still respectable, it may not inspire the same level of confidence for buyers looking for long-term reliability in their power supply.

Brand Reputation

Brand reputation plays a significant role in purchasing decisions, particularly in the competitive PC component market. Corsair is well-regarded for producing high-quality power supplies and has a solid track record of customer satisfaction. The CORSAIR RM850x is often seen as a gold standard in the power supply market. Thermaltake also has a loyal customer base but is generally considered a budget brand. This perception may influence users who prioritize reliability and performance over cost, leading them to choose the CORSAIR model.

Which should you buy?

Choosing between the CORSAIR RM850x and the Thermaltake Smart 500W ultimately hinges on your specific needs and budget. If you require a high-performance power supply with excellent efficiency, modular design, and extensive warranty coverage, the CORSAIR RM850x is the clear choice, albeit at a significantly higher price of $161.93. However, if you are on a tighter budget or need a basic power supply for a mainstream build, the Thermaltake Smart 500W, priced at $39.99, may suffice. Ultimately, consider your future upgrade plans and performance requirements before making a decision.