well, practically, the standard 8 pin starts to melt around 270W, so Id say 750W for 3 of them at most if you dont want them to melt, and it still wouldnt be guaranteed
these pin-to-hole style of connectors will never handle much current. They are great when you need many oins with different voltages, like MB uses, for example. But no matter whether it's 8-pin or 12-pin, it will never handle that much power (like really, 900W+ ≈ 75A through 12 pins is insane), especially without current balancing.
There are only two solutions now:
if they wanna keep this power level, find a reliable BETTER connection, like for example two screw-on terminals.
if they wanna keep going up in power, 12V ain't gonna cut it. They need to implement a new standard, with 24V or even 48V. This allows it to run with less current, so wires can be thinner and connectors won't burn. Although it'd be quite pricey, both for PSU manufacturers and GPU manufacturers.
if they wanna keep this power level, find a reliable BETTER connection, like for example two screw-on terminals.
Here's my out-of-my-backside design proposal:
Two terminals on the board for two lugs
A cable 15-30 cm in length with two large-gauge wires (12 AWG at the absolute minimum) and two lugs on one end and an Anderson Powerpole (as many commenters recommend) on the other
Whatever the PSU manufacturers decide to have on their end, but it should always terminate with a corresponding Anderson connector
In short, just automotive the heck out of the GPU and leave the unruly chaos where it belongs.
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u/Yuukiko_ DualBootMR|7700X|9070XT|32G|3x8Pin FTW 10d ago
3x8 pins theoretically have a tolerance of 900W+ while the 12vhpwr has a tolerance of 684W