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Seasonic are using a Hong Hua 135mm fan, Model number HA13525H12F-Z – the same model featured in the PRIME 1000W and 1200W Platinum supplies. This is a Fluid Dynamic Bearing Fan selected for low noise characteristics. Regular readers may recall that the Seasonic Snow Silent 750W unit shipped with a smaller 120mm fan from the same company so its a good move that Seasonic are adopting larger fans.
Larger fans of similar quality are able to push more air at the same speeds, likely often spinning slower to reduce noise emissions. This fan is rated at around 150,000 hours at 25c.
Below - a High Resolution Gallery of the internal layout of the Seasonic PRIME 850W Platinum
The build quality, like previous 1000W and 1200W units, is very high. Soldering quality is excellent and we see little heatsinks in key positions which help deal with heat. These units have all very high efficiency levels so there is really no need for a lot of heatsinks in the design.
Seasonic are using high grade 105c rated Japanese capacitors in both primary and secondary stages which is good to see – if expected at the asking price. The two primary capacitors are both rated 400v 330uF, for a total of 660uF. By comparison the Titanium PRIME 850W model we reviewed some time ago was massively over specified – fitted with a 650uF and 450uF capacitor for a total output capacity of 1100uF.
Japanese caps are filtered through the secondary stage as well, which is reassuring to see.
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