The new Sparkle PSUs are from Great Wall and it is unknown how they will perform, nor do we know how well they are built. It's possible they will be somewhat decent, but until someone who knows what they are doing gets their hands on one, I would be cautious. Even if they are incapable of reliably providing 1250W, there aren't many systems that would actually reach above what they are actually capable of, so I would completely disregard any consumer or professional 'reviews' like the one you linked to.
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