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Power Supply Platforms Easily Explained
Manufacturers who build power supplies (Seasonic, CWT, Super Flower etc.) for companies who order them (Corsair, EVGA, others) usually don't spend their time and money to research an entirely new construction for every new power supply they are ordered to make. Instead, they often engineer just a few designs which perform on different levels, and try to reuse them in as many brands as possible, as far as the quality boundaries allow.
Let's say Corsair, EVGA and Rosewill order Seasonic to make one new semi-high quality power supply line for each of them. Seasonic may not design 3 new platforms from scratch. Instead, they can take one of their already-existing constructions (like Seasonic G) and use it in the new lines.
The result is creation of imaginary "Corsair GX", "EVGA SuperG" and "Rosewill Gsonic" lines. Each of them uses the Seasonic G platform inside, so it performs the same or very much similar. Corsair, EVGA and Rosewill can add their own ideas on top of it - a nice case, a different fan, braided or ribboned cables, semi fanless mode or what have you, but it's still going to be mostly the same power supply in different flavors.
Why it's useful + real world examples
Examining the power supply platform is essentially a way to quickly guess the performance of a power supply, if we don't have access to the tests. It can also serve as a way to see how many power supplies from different brands are, in fact, identical or very similar.
Photo sources: Rosewill, NZXT. The overhead view hints greatly that they are both based on Super Flower Golden Green platform, so their performance should be very similar; it helps when you can't find any precise reviews at all. The platform is a very good hint, but can't entirely replace a full, standalone teardown and test. To determine the performance of this exact unit (and not base your judgement on the stock platform performance), as well as the exact components used, we'd have to find a complete teardown and accurate tests on good PSU review sites.
Isn't knowing the OEM name enough?
Is knowing who made the car ("Ford", "Audi"...) enough to evaluate its performance? Many people who want to identify a power supply simply stop on the OEM name, like "Seasonic" or "CWT" and make their opinion on that. It's not accurate to generalize "Seasonic makes better PSUs than CWT". To further help you with visualising how it works, here's a table with two easy to understand analogies with graphics cards: