>We already have 6 and 8 pin additional connectors on graphics cards, so the connector/slot aspect is easily solved.
Those 8 pins are 12V, not 1V. They are spec'd to carry like 12.5A each - make it 15A - bit warmer wires. So around 15W per connector at 1V... and the need is over 300W. So there you have it 20 8-pin connectors.
There is a reason power lanes of the grid are higher voltage - they need a lot less current, so they are efficient. Lower voltage should remain on the PCB with multiple power planes.
To argue alongside your excellent points: it's not just bit warmer wires, but also the underlying voltage drop that would be harmful in such a design, especially in the context of a 1V DC supply.
Those 8 pins are 12V, not 1V. They are spec'd to carry like 12.5A each - make it 15A - bit warmer wires. So around 15W per connector at 1V... and the need is over 300W. So there you have it 20 8-pin connectors.
There is a reason power lanes of the grid are higher voltage - they need a lot less current, so they are efficient. Lower voltage should remain on the PCB with multiple power planes.