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Seasonic are using one of their favourite brands for the fan – a Hong Hua 120mm Hydro (Fluid) Dynamic Bearing (HDB) rated 12V, 0.58A up to 2,200rpm. Model number HA1225H12F-Z. There is a sheet of plastic along the top to specifically force air flow across the components underneath. i wouldn't class this fan as a flagship fan by any stretch of the term (it was always loud in our testing in previous years) and its been around since at least 2017.
Seasonic are keen to promote their ‘Optisink Design'.
Saying it has a 48% more compact PCB design and 8 times higher heat conductivity. Seasonic also say that this design features enhancements in Active PFC, Full bridge LLC, synchronous rectification and the DC-DC converter. Improved heat dissipation and higher power output stability mark the utilisation of SMD components to increase the overall quality of the power supply.
This Optisink design is a compact and integrated circuit layout where the PFC and LLC power units get combined and vertically stacked, shown above. This helps airflow inside the unit and heat dissipation.
I can't remember the last time I saw a Seasonic power supply with a Chinese (Taiwanese) TEAPO cap inside – a brand who got the nickname ‘cheapo' back in the day. I am sure their standards are much higher now in 2024, but still, for me it is a little surprising to see Seasonic drop the higher grade Japanese caps in what they consider a mid range unit. This primary stage TEAPO cap is rated 105c, at 400v with an output of 470uF.
These units offer OPP, OVP, UVP, OCP, OTP and SCP protections.
