RTX PRO 6000: Damage to Seasonic-Noctua Cables Discovered in Dual-GPU System - igor´sLAB

The damage was found on a system equipped with two NVIDIA RTX PRO 6000 Blackwell Workstation Edition graphics cards, each rated for a maximum power draw of up to 600 watts. The owner had already limited both GPUs to around 500 watts, yet both power cables showed similar changes, with one visibly more affected than the other.

The location of the damage is notable. The worn or hardened braided sleeve was found not only at the graphics card connectors, but also at the power supply end. According to the owner, the GPU-side connectors were disconnected and reconnected several times during troubleshooting because a GPU or NVMe drives would intermittently disappear from the PCIe bus. The power supply-side connections, by contrast, were barely moved, yet showed comparable or in some cases more pronounced changes.

This distinction is important in this case. The published photos do not show a classic melted 12V-2×6 connector. According to the information available, neither the graphics card connector housing nor the power supply connector housing shows visible deformation or discoloration. The actual insulation on the copper wires also appears to have remained intact. The outer textile sleeve is what is initially affected.

Even so, this visible condition is not something to ignore in a system of this power level. A brittle or heat-affected cable sleeve immediately next to the connector may indicate mechanical or thermal stress that should be investigated more closely. The owner has therefore taken both cables out of service and obtained replacements.

Possible causes and next steps

It is also notable that both cables show signs of damage in the same system. A single damaged cable could more readily be attributed to a manufacturing defect, mechanical stress, or unfavorable routing. Two similarly affected cables make a common cause at least more plausible, but are still not enough to conclude that there is a general fault with the Seasonic power supply or the RTX PRO 6000. The power limit does not provide an unequivocal all-clear either. Although 500 watts is below the maximum possible 600 watts for an RTX PRO 6000 Workstation Edition, it still represents a high sustained load on a single 12V-2×6 connector over extended periods. What matters is not just the total power, but also how evenly it is distributed across the six 12-volt contacts and how low the contact resistance remains at the connection points.

The owner is considering running the cards at 450 watts in the future. According to the owner’s own measurements, reducing power to 300 watts resulted in a performance loss of approximately 40 to 50 percent, depending on the workload. These figures come from the owner’s specific use case and cannot be generalized to RTX PRO 6000 systems. For other users of such systems, the main practical takeaway from this individual case is that cables and connectors should be visually inspected occasionally under very high sustained loads. Frequently unplugging and reconnecting them as a precaution would be counterproductive, since mechanical wear on the contacts should also be avoided.