Seasonic have opted for a Ong Hua 120mm fan, Model number HA1225M12F-Z. This is a high grade Fluid Dynamic Bearing (FDB) fan designed for low noise emissions.
These fans not only tend to emit lower noise levels, but they are rated to last longer as well due to the lubrication of the bearing itself.
The Seasonic XP platform design is well built, and the soldering quality is excellent throughout. Not the first time we have tested an XP2/XP3 unit.
Behind the AC receptable is a sealed PCB which is home to some of the components of the EMI filter – a single X cap, four Y caps and a CM choke. The other components of the filtering stage are on the main PCB, which include an MOV, two pairs of Y and X Caps and two more CM chokes.
The primary side is a full bridge design with an LLC converter for lossless switching. The secondary side uses a synchronous design with +12V fets on the main PCB. The DC-DC converters are installed on the modular PCB to help reduce power loss.
The main PCB and modular PCB incorporate high grade Japanese electrolytic and solid capacitors. Seasonic are using two high grade 105c Japanese Nippon Chemi Con capacitors rated 420v 270uF (540uF combined). This is a high spec configuration for a 750 watt power supply – this Antec Edge 750W for instance (a Seasonic S-12G/G Series design) ships with a single Rubycon 420v 470uF capacitor.