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Old 07-19-2019, 10:17 AM
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A single connector with 2 connectors is NOT multiple rails.
The rail is implemented on the PSU, not in the cable. You may have a rail for each PSU connection (in a modular PSU). It depends on how its implemented.

As noted in the link to jonnyguru, multiple rails is for safety. It prevents any single 12V rail from having too much current. You DO NOT want 1000W (83A) of power going down a single connector!! Multiple rails prevent that.
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