FSP Mega GM 1200W PSU Review: Gold Label, Platinum
Tom's Hardware reviews the FSP Mega GM 1200W power supply, finding its in-house platform delivers efficiency exceeding its 80 PLUS Gold rating, along with
The FSP Mega GM 1200W power supply delivers efficiency in the Platinum range despite being marketed as an 80 PLUS Gold unit, according to a review by Tom's Hardware. Priced at $229, the unit features a fully in-house FSP platform, Cybenetics A++ acoustic performance, and a ten-year warranty.
FSP is a major Taiwanese power supply manufacturer founded in 1993. The Mega GM series, which includes 850W, 1000W, and 1200W models, is built to the ATX 3.1 and PCIe 5.1 standards. The review unit is the 1200W flagship.
Specifications and Design
The power supply arrives in a box displaying 80 PLUS Gold and Cybenetics Gold certifications, alongside an A++ acoustic award. The internal bundle includes mounting screws, an AC cable, cable ties, combs, a jump-start tester, and a storage pouch. All cables are individually sleeved. A key feature is a single native 12V-2x6 cable capable of delivering 600W.
The chassis measures 150 x 150 x 86 mm, which Tom's Hardware notes is compact for a 1200W unit. The exterior is a matte black finish. It includes a separate ECO switch to control the semi-fanless mode. The modular connector bay is keyed to prevent incorrect cable installation.
Internally, cooling is provided by a 135 mm fluid dynamic bearing fan. The platform is designed and built entirely by FSP. The unit uses a half-bridge LLC resonant topology. All electrolytic and solid-state capacitors are from Japanese manufacturers, specifically Nippon Chemi-Con, Rubycon, and Nichicon. The unit lacks dedicated fan-failure protection.
Performance and Efficiency
Tom's Hardware tested the unit with high-precision electronic loads and other equipment in a 25°C ambient environment. The review found the Mega GM 1200W posted strong efficiency through low and mid-loads. The figures, however, dip at full load.
| Load Condition | Efficiency at 230 VAC | Efficiency at 115 VAC |
|---|---|---|
| Average across nominal band | 93.0% | 90.7% |
| Peak (near 30% load) | ~94.6% | ~94.6% |
| Full sustained load (1200W) | 91.0% | 87.3% |
The publication states the unit's only independently verified efficiency credential is from Cybenetics. There is no corresponding entry in the official 80 PLUS database. Cybenetics' averaging method allows the unit to reach a Platinum rating, while the stricter 80 PLUS test points would cap it at Gold due to the full-load efficiency drop.
Ripple suppression and load regulation were rated as good but not spectacular. The protection suite is described as comprehensive with real headroom. The acoustics earned the highest practical grade from Cybenetics.
Availability and Verdict
Tom's Hardware reports the Mega GM 1200W has very limited availability in the United States. The review concludes the unit is one of the most complete high-wattage options near its price point, if you can find it. It is built on an in-house platform with entirely Japanese capacitors. The compact chassis and native 600W 12V-2x6 delivery are highlighted as strengths. The unit's electrical performance is kept just short of flawless by its mid-pack ripple suppression and loose minor-rail regulation.
