A Look Inside

At a first glance we already see a nicely and well-manufactured enclosure, which is a solid hint towards a high-quality product. Apart from an elegant design the paint job is good looking and well-executed.

The Prime Gold 850W has been equipped with a Hong Hua 135mm fan (model number HA13525H12F-Z) and which can be found also in the Prime Gold 1000W and Prime Platinum 1000W units as well. It's a Fluid Dynamic Bearing fan and it's rated at around 150,000 hours at 25°C.

Right behind the AC receptacle there starts the input filtering stage, where we find one X cap and two Y caps. Going one step further to the main PCB we see four Y caps, one X cap and two large chokes. Furthermore there is a TVS diode, which helps protecting the circuitry from voltage spikes. The PFC section is created with two FET 5R190CE and a single diode.

On the secondary side there is a CM6901 PWM controller, which is clearly visible. All the capacitors come from Nichicon and Nippon Chemi-Con and are therefore of Japanese origin. Furthermore there is a Weltrend WT7525 power supply supervisor chip, which enables all the protective functions such as over voltage detection, under voltage detection, over current detection and quite a few more.

Apart from that the secondary side features a daughter board which has been equipped with all the moduler connectors and it's been soldered to the main PCB allowing Seasonic to minimize efficiency losses. Last but not least soldering is on a very good level, which is what we've come to expect from Seasonic's high-end power supplies.

Page 1 - Introduction

Page 2 - Preview

Page 3 - Delivery / Specs

Page 4 - A Look Inside

Page 5 - Result Analysis and Discussion

Page 6 - Conclusion