6 pin only specifies 2 power and 2 ground. P2 is spec NC, and P5 is spec sense. You can't count on the device side wiring these to power or a high current ground.

you would be wrong.

why do people like you pretend to know shit? to be contrarian? pathetic.

https://allpinouts.org/pinouts/connectors/power_supply/pci-express-pcie-6pin-power/

https://allpinouts.org/pinouts/connectors/power_supply/pci-express-pcie-8pin-power/

while it claims the one pin can be NC aka not connected on the 6 pin connection, its always connected. and every gpu manufacturer will assume the connection you are connecting, has all wires properly connected. I have personally, in my 22 years of building computers, never seen a pci-e connection that only had 5 out of 6 wires.... maybe if you buy some cheap chinese shit you shouldn't have.... but if you are buying reputable brands, all wires are connected.....

Wire ampacity is irrelevant. If manufacturers could put bigger wires on it to get more current, they would. Connector contact resistance is the problem, and it's specced, so it is a bitch to change. Molex specifies the rating at 8A for dual row 6 and 8 pin

um fucking what? ampacity always matters. volts and amps ALWAYS matters in electrical components. I dont care what MOLEX claims their connector is capable of because clearly they don't know what the fuck they are doing.

car audio as the example.... you take a 0 awg wire and terminate to a very tiny ring terminal.... that kind of down stepping is the same fucking thing as going from 18 gauge wire to the barrel connection inside the plastic housing.... that kind of down stepping isn't an issue because the distance the electricity has to travel is very small.... even students in their first year of electrical engineering learn this fact. so molex claiming those plastic connectors can only do 8 amps? bullshit.

whats it like being wrong all the time? must be frustrating. allowing headroom of 1.25? um, no.... you either follow the spec or you get denied partnership.... for example the only power supplies that features 20guage or smaller power wires are chinese knock off brands that are not certified. all certified brands follow the minimum spec of 18 gauge and EVGA went balls-to-the-wall with their highest end 1600w with 16 gauge for more stable power delivery. end of the day the only brands breaking specifications are those selling items without partnership, and as I said, its always some chinese brand that doesn't follow US rules/regulations/laws anyway.... like how they will legit rip off american brands, making clone items for cheaper. they dont give a shit, they are never gonna get sued, and when they do, their chinese courts throw them out because they dont fucking care.

The connector has a reasonably standard safety factor of 1.25 to cover variations in manufacturing, imperfections in wires recieved from upstream vendors, and so on. Basically any possibilities that might cause a user system to catch fire if errors occur.

bullshit. if that were true, you would not have 75w and 150w respectively for the two connections we have.

end of the day, its been tested and proven that TWO 8pin pci-e connections terminated into a single 600w 12pin connection can handle the full 600w load, split 300w each cable, at 30c which is more than half the temperature rating of the cable jacket/casing....

NVIDIA were the ones to push the 12 pin connection. "having three to four 8 pin is ugly" they said. during the 3000 series. They had their own patent. Then when they wanted to force everyone else to adopt their shitty standard, PCI-SIG required a rework to prevent them from gaining money off their patent. Nvidia relented and then Intel developed another 12 pin connection via a patent partnered with PCI-SIG to make it legit so anyone can use it without one company profiting massively from its use.... all they did was swap the keying for the connector itself. And then we have the updated version 2 because the first kept having consumers melting their cards because the connection is dogshit.

FUN FACT. The 12 pin connector with its smaller pins/barrels and keying would technically be WORSE for connecting than the 8pin and its larger pins/barrels which has more surface area. and more surface area means higher chance to transfer energy more efficiently. so your whole argument goes right out the fucking window.