According to the product page, the Seasonic Prime SnowSilent series will only be available in three power output configurations, 550W, 650W, and 750W. In addition, the series will offer passive mode, which does not spin up the fan until it goes over 40 percent load, 80 Plus Gold certification for the 550W, 80 Plus Platinum for the 650W and 80 Plus Titanium certification for the 750W model and more.
The Seasonic SnowSilent 550W and 650W models are 14cm long while the 750W is a standard 17cm long PSU and the only one that offers two 4+4-pin EPS power connectors. All three models offer fully-modular design, DC-to-DC switching with single +12 rail, active PFC, micro tolerance load regulation, gold-plated connectors, and all the usual protections. It also comes with a 12 year warranty.
The Seasonic Prime SnowSilent PSU series should not be confused with the earlier available SnowSilent series, as the new one offers plenty of improvements and, hopefully, it will also eventually come with a 1050W output as well.
Unfortunately, Seasonic did not reveal any details regarding the price or the availability date for its new Prime SnowSilent PSU series.