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u/Doomslayer606 posted on r/PcBuild with the title “Did I just save my RTX PRO 6000 GPUs from melting?” with photos of the 12V-2×6 cable’s braided sleeving frayed. The poster asked in the description whether this was normal degradation, a manufacturing issue, or overheating. The poster reported that the damaged braided sleeving felt stiff and peeled off easily, which is a strong indication of heat damage, and the comments were sure that it was.
Luckily, the poster’s GPUs were safe, but the 12-2×6 connectors are notorious for melting due to high power draw. One comment asked if they kept the stock power limit, to which the poster responded that they lowered both GPUs to 500W — another user responded asking why the poster wouldn’t use 300W, but the poster said it would reduce performance by up to 50% and they need to keep up with their deadlines.
Theoretically, the cable should be able to handle 500W, as each positive pin would only handle 6.94 A, which isn’t enough current to significantly heat up 16 AWG wire, but one of the main causes of cable overheating is uneven current distribution across the pins. Since only two of the pins melted on both cables, it’s likely those received high-current spikes often, leading to heat buildup.
Users have suggested aftermarket cables like the Corsair ThermalProtect 12V-2×6 cable that detects overheating cables, and the Thermal Grizzly WireView Pro II or Aqua Computing AMPINEL, which have active current balancing to prevent any wire from taking too much current alone. In a recent story, someone even created a power distributor, distributing the 12 pins into two 8-pin cables with a custom-designed PCB, which lowered the cable temperatures significantly — while another modder had a cursed solution , soldering thick cables directly to the RTX 5090’s power pins.
Proven 8-pin PCIe plugs aren't immune to melting
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Reference reading
- https://www.tomshardware.com/pc-components/gpus/SPONSORED_LINK_URL
- https://www.tomshardware.com/pc-components/gpus/nvidia-rtx-pro-6000-users-cables-almost-melted-even-when-limited-to-500w-12v-2×6-cables-appear-to-still-cause-problems-show-clear-signs-of-melting#main
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Informational only. No financial advice. Do your own research.