This thread tackles one of the most consequential ongoing controversies in modern PC building: the alarming tendency of the 12V-2x6 (and its predecessor 12VHPWR) connector to melt under load on high-end GPUs like the RTX 4090 and 5090. The OP asks a reasonable engineering question — if the connector pins are the bottleneck, could you build a custom cable using thicker 14 AWG or even 12 AWG wire instead of the spec's 16 AWG, to lower resistance and reduce heat?

It's a small thread, but the discussion is dense with practical electrical knowledge that's directly useful to anyone running a 600W GPU:

• The wire isn't really the problem. 16 AWG is already rated to carry well over the ~9.2A per pin the spec calls for. The failure mode is almost always at the terminal-to-pin interface — uneven current distribution across the six 12V pins, sometimes pushing 20A+ through a single contact that's only rated for 9.5A.
• Thicker wire can make things worse. 12 AWG is stiff and heavy. The mechanical stress on the Mini-Fit Plus terminals can pull pins out of full seating, increasing contact resistance — exactly the condition that causes melting. The mating connector on the GPU side is the same regardless of what wire you crimp to it.
• Crimping at home is risky. Proper Molex Mini-Fit Plus HCS crimps require a specific die and pull-test verification. A bad crimp adds resistance right where you can least afford it.
• Better mitigations: use a cable with per-pin current sensing (like the Asus ROG Astral or Corsair's monitored cables), ensure full insertion until both latches click, and avoid tight bends within 35mm of the connector.

The educational value here is that it's a perfect case study in treating a symptom vs. a root cause. The intuitive fix ("use bigger wire") would actually exacerbate the real failure mechanism. Nvidia's decision to drop the load-balancing shunt resistors that the 3090 Ti had — leaving all six pins electrically paralleled with no way to detect imbalance — is the architectural sin behind the whole saga.