Also, just so the general audience is aware, DerBauer there is the lead engineer of Thermal Grizzly, the well regarded thermal paste manufacturer, who therefore probably has some idea what he's speaking of and has equipment readily available beyond the average consumer / youtuber.
But the larger point is that if the new cards are drawing per-line power close to the max spec, and Nvidia has cheaped out on per-line overamperage detection (though I would point out, not mitigation - I am not aware of any designs that actively shut down the card once they detect overamperage), then the cables themselves need to be literally 100% reliable, and there's way too many stories of cables not being seated quite perfectly or having hairline fractures.
Unfortunately, I don't know how the general public is going to get any clarity on the power cable front, barring someone buying hundreds / thousands from various manufacturers and various lots and (briefly) testing them under designed 5090 loads to see how many are fine and how many will take out the test rig.
