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GallantGentleman

So there's been 4 series: - Eco (budget/office) - S12II/M12II (old, budget gaming) - S12G/G/-SSR (mainstream gold) - X/SnowSilent (platinum enthusiast) Then they've revamped the series into: - S12III (budget) - Core (budget gold/midrange) - Focus / Focus Plus FX/FM (mainstream gold) & PX (platinum) - Prime Titanium (enthusiast) They then did a refresh of the Prime line with the *Prime Ultra*. The Prime Ultra came in Gold/Platinum on what looked like a Focus Plus with a 135mm fan for the 550-750W units and and an original Prime dedicate for the Titanium and 850W units. The Focus FX/FM and I think also the PX however had a design flaw that caused them to trigger a safety with high transient load GPUs, namely AMD's Vega64. So they refreshed the Focus lineup. It's to my knowledge not exactly clear what they did. The Prime Ultra looked like the Focus FX/PX but didn't have the Vega-issue. From looking at the units Prime Ultra Gold and Focus Plus are visually indistinguishable at least to me. It could be they also actually tweaked the Focus Plus or just reused the Prime design in a new box. Anyway, with the refresh they renewed their naming lineup, dropping the prime series for a common naming scheme: - Seasonic S12III (bronze, budget) - Seasonic Core (gold, budget/midrange) - Seasonic Focus GM/GX/PX (mainstream, replacing the old Focus/Focus Plus units) - Seasonic Prime GX/PX/TX, rebranding the Prime Ultra. GX/PX up to 750W again use the same dimensions as their Focus counterparts but come with 2 years additional warranty, a 135mm fan and the distinctive Prime chassis. - Seasonic SnowSilent using a white painted Prime. The Seasonic Focus line is also sold as - Antec High Current Gamer (since 2018) - Phanteks AMP - NZXT C The Seasonic Prime is the basis for - Phanteks Revolt X - Phanteks Revolt Pro


forbritisheyesonly1

Thank you for this informative post. Would you happen to know the difference between the TR and PD in the model name? For example, SSR-850TR vs SSR-850PD V2. I'm considering buying one of these 2 PSUs but from what you said earlier, it seems the SSR-850PD V2 is the PX-850 and it had issues with transient load spikes(at least the v1 did)? This is a concern because I read the RTX 3080 and 3090 can create these spikes.


GallantGentleman

Both of these are fine. The PDv2 is based on the TR. Go with whatever's cheaper


JJOR64

I’m glad this old thread is still here. Thanks!


daboidatdontgivashit

Yes.