Gaming PC

RTX 4090 16-Pin Cable Surveys Indicate Some Use ‘Under Spec’ Wiring

The Nvidia GeForce RTX 4090’s melted power cable issue continues to cause confusion. As more information is dug up and presented, the big picture isn’t always clear. The RTX 4090 may be one of the best graphics cards out there, but it’s currently in trouble with supply, pricing, and whether the adapter is “safe” for long-term use. It would take Nvidia to issue an official statement about the observed issues, as there seem to be so many variables that even the biggest tech sites and video channels have been unable to come to any useful conclusions.

For example, on Saturday we reported findings from Igor’s lab regarding the root cause of the 16-pin power connector fusing problem. Igor discovered that one of his cables was constructed in such a way that a critical connector would “easily” fail, and suggested crimping rather than soldering the connector joints on the cable. I suggested to his manufacturer.

Igor’s reasoning was basically that soldering is not ideal for connectors that may be subjected to pressure, stress, or strain. can become brittle, bubble, or introduce corrosive compounds into the wiring. Instead, manufacturers must use wires that are inherently flexible and crimped joints that are said to flex easily. However, Igor’s destructive testing of the cable did not show any problems with the socket melting.

And on Sunday, Gamers Nexus (GN) Steve Burke Video published (opens in new tab) About this same topic. GN did more extensive testing, using 5 cables selected from different sources, 3 powerful RTX 4090 graphics cards, running for several hours at stock and overclocked (>600W) settings, melting Tried very hard to reproduce the socket. GN has also invested in new thermal imagers to get to the bottom of the issue. Equipped with 5 cables, 3 GPUs, an infrared camera and probes, the test began.

During the course of our investigation, GN removed the adhesive strain relief tape to expose the metal cable/connector area within the GPU power plug. Carefully done “without hurting them”. Burke recalled that Igor’s investigation found that he was using a 150V cable, but with all five of his adapters that GN had, the used I found that all of the component cables were labeled with a rating of 300V (14AWG, 105C).

The partner GN spoke with said that the 300V cable on the spec, which means Igor’s cable must have been underspec. The specs say that for the power supply he needs 300V 14AWG, but the 4 “sensing wires” could use a lower gauge. There were other differences as well. For example, Igor said that removing the sleeve could “quickly tear” the metal of the underlying thin plate, but no such problems were observed with the GN. Check out the chart below for other key differences between Igor and his GN’s cables.

(Image credit: Gamer Nexus)

With more soldering points, a more evenly distributed power feed, and 300V rated wires (labeled), GN tried various “worst case” connector destruction methods, but I was not able to reproduce the overheating issue. The graph below shows that in a continuous stress test of up to 8 hours, the worst damage only increases the temperature around the connector by 8°C.

Related Articles

Leave a Reply

Your email address will not be published. Required fields are marked *

Back to top button