The Prime GX-850 PC power supply delivers 850 watts of power. With the One Seasonic initiative, the Prime TX, Prime PX, and Prime GX series became the successors to the Seasonic Prime and Prime Ultra series. The Prime series has always delivered outstanding performance and has, over the years, become the pinnacle of technological excellence and quality. This third generation of the Prime series was introduced not only with a common naming scheme but also with updated overall design and connection cables. The Prime Gold Series has received the 80 PLUS Gold certification with an efficiency rating of 90% at 50% system load. Seasonic's years of experience in developing the quietest and most efficient power supplies on the market have been applied to the development of Hybrid Mode, a state-of-the-art fan control system that allows users to keep overall fan noise at the lowest possible level.

• Power: 850 watts
• 80 PLUS Gold certification
• Efficiency: 90% at 50% system load
• Hybrid Mode fan control system