This is clearly a Seasonic design. There are several rows of heatsinks across the length of the PCB.
An AC Line filter and receptacle which continues with a single X capacitor. There are two coils, an X capacitor, two Y capacitors and a MOV.
The primary capacitor is by Nippon Chemi Con and is rated 390 uF, 420V at 105c. All other capacitors are also by Nippon Chemi Con, which is reassuring.