FSP Mega GM 1200W PSU Review

1. Introduction2. Bundle & Cabling3. External4. Internal5. Testing Methodology and Results6. Closing Thoughts7. View All Pages

The FSP Technology Mega GM 1200W has performed extremely well throughout our testing over the past week. Overall impressions are very positive, and the use of high-quality components throughout the platform is reassuring to see. This includes premium 105C-rated Japanese capacitors on both the primary and secondary sides, which immediately inspires confidence in long-term reliability.

From a technical standpoint, the Mega GM 1200W delivers excellent power quality. Load regulation is strong, and the unit passed our cross-load testing without issue. Ripple suppression comfortably meets industry stability requirements, although it does fall slightly short of the very best units on the market. Even so, it is clear that FSP has not cut corners internally, and the overall electrical performance remains solid and dependable.

Noise performance is where this power supply truly stands out. FSP has done an excellent job tuning the fan profile, with the unit remaining very quiet under all typical operating conditions. Even during sustained loads approaching 1000W, the Mega GM 1200W was barely audible. It is easily one of the quietest high-power power supplies we have tested, making it an excellent option for users who value a low-noise system.

Based on our own efficiency testing, this unit comfortably exceeds 80 Plus Gold requirements and performs beyond Cybenetics Gold levels. We were also able to obtain the official Cybenetics reports, which certify the Mega GM 1200W at Platinum efficiency. This appears to be a deliberate positioning decision rather than a limitation of the design itself.

We have recently encountered a similar approach from be quiet!, who explained that their own Platinum-capable units are marketed as Gold to account for production variance and to represent average efficiency honestly rather than relying on best-case samples. It is an interesting and increasingly common strategy.

Overall, the FSP Mega GM 1200W is an excellent and well-balanced power supply. It delivers very high levels of sustained power, operates extremely quietly, is fully modular, and uses premium internal components throughout. Backed by a 10-year warranty, it presents a compelling package. As is often the case with FSP products, global availability may be limited, but at an expected price of around £200 / $229, it offers strong value for money given the performance on offer. If retail links become available later, they will be added here.

Pros:

• 10-year warranty.
• Platinum-level efficiency in testing.
• 105C-rated Japanese capacitors on primary and secondary stages.
• High-quality fluid dynamic bearing fan.
• Top tier build quality.
• Exceptionally low noise levels.
• Passed the cross load test.
• Load regulation is strong.

Cons:

• Availability may be limited, as is often the case with FSP products.

KitGuru says: If you are able to find the FSP Mega GM 1200W available in your region, it comes highly recommended. High-quality internal components ensure stable and reliable power delivery, while low noise levels, Platinum-class efficiency, and a long warranty make it one of the most compelling high-wattage power supplies we have tested.

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