Cheap Chinese LED's safe?
No, power supplies these days are single rail or multi rail but with stupid high current capabilities, like 20-30 A per rail
If by some miracle the strip would fail so catastrophically that it's a short which won't break by itself, you still have the thin wires between the connector strip and the molex connector which can probably only handle about 2A continuously.. if there's a short, they'd act like a fuse and at maybe 8-10A the insulation on them would melt (again making a bit of smoke and smell) and then the copper wires would glow white and eventually break.
If somehow the thin wire doesn't break , the molex connector itself is rated for 5A per contact, so at around 10-15A the contacts would be so hot that the plastic of the connector would start to brown out and make smoke and the contact could expand enough to break the connection.
If the connection isn't broken... the power supply won't care, technically the AWG18 wire between the molex connector and the power supply can carry about 8-12A so around 120-150 watts so any decent 500w or higher power supply can give that much power for ever... the power supply wouldn't be able to make the distinction between a shorted led strip and let's say a video card's pci-e 6 pin connector, it will keep pumping 100 watts or more into that short circuit until something eventually breaks (resistors get carbonized, copper eventually breaks down etc)
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