What is the maximum power that can be applied to the PSU cables to power devices?

Question

Electronics

Good afternoon!

There is a Thermaltake TR2 Bronze TR-750P power supply, on the label of which it is written that 62A (744W) is supplied to 12V, the line seems to be one for a 12V power supply. One of the power supply cables has 3 molex connectors, each of which can output up to 132W. Do I understand correctly that they can all be loaded simultaneously with loads up to 132 * 3 = 396W?
Similarly with a cable with two 8pin connectors, can it handle up to 150+150=300W?
I understand that the total load should be less than the maximum possible 744W (and preferably ~ 2/3 of this value).
Thanks in advance!

ps: another question: I have a SATA (54W) - 6pin adapter. I need to connect a video card through a riser in MP, the PCI-E slot of which outputs up to 75W. The manufacturer implies that the video card will receive up to 75W through this PCI-E, but the adapter can only give up to 54W. Can I connect it via a SATA - 6pin adapter, given that another 150W will be supplied through the add. 8pin power? That is, the video card, having received 54W, will simply take the rest from 8pin? I'm trying to figure out how it works

Answer 1

Do I understand correctly that they can all be loaded simultaneously with loads up to 132 * 3 = 396W?

Google the dependence of the rated current on the thickness of the wire, as a bonus we come across a calculator:
https://www.powerstream.com/Wire_Size.htm
We set the voltage to 12V, the length of the wire ... well, let it be 1 foot. Current 33 amps (396W/12V=33A). And we see that the voltage drop will be within the allowable 5% with a 18AWG standard wire. At the thinner 20AWG (the higher the number, the thinner) the voltage is out of range.
The answer is only from the point of view of the wire: if the wire marking is 18AWG, then 396W can be removed without excessive voltage drop with a wire length of 1 foot (~30.5 cm). More length - lower voltage will drop, to the detriment of the stability of the iron.
These wires will not burn out from a load of 396W, and the insulation will not melt. The problem is the voltage drop.
Separately, you still need to consider the connectors - they also have a voltage drop. But for simplicity, we will omit this. :)
To see the markings on the wires, you need good eyesight or a magnifying glass.

Answer 2

Mini-Fit connectors hold 10A per pin. Thoroughbreds can do 13A, but with 16 AWG wire.
This means that a 6-pin can press 468W at 12V until the contacts burn.
I don’t know about ordinary molexes and I’m too lazy to look. From regular wires, smoke will go much earlier.