Brand. Off brands use components made in china that don't have a specific QA and they label peak power as a marketing tool. For a power supply you literally get what you pay for.
Even the CX430 is a much better unit than what you purchased.
CORSAIR CX series CX430 430W ATX12V v2.3 80 PLUS BRONZE Certified Active PFC Power Supply - Newegg.com
You have to take reviews put on sites with a grain of salt, especially Amazon and Newegg.
The reason being is because the people buying these products typically know jack about what they are purchasing and rate it "great!" if it simply powers their PC up.
For anybody here watching this thread they can agree, 30amps on the 12v rail is terrible for a 500+W PSU. To give you an example, the 430w rated Corsair CX up there has 32a on the 12v rail further solidifying my point about cheap brands rating their units at peak voltage when they could never actually handle it.
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