Melting 16-pin connectors keep making headlines, and some RTX 5090 owners have started taking the protection of their expensive cards into their own hands. Reddit user DallasGrave has modified an MSI GeForce RTX 5090 with two extra 8-pin PCIe power inputs that work alongside the card's original 16-pin connector. According to their post on r/pcmasterrace, a small pickup PCB is soldered to the contacts of the 16-pin header, and that board feeds a second PCB carrying the two 8-pin sockets. The card then runs on three cables in total. DallasGrave says each conductor now carries roughly 3 A, and that the wires never crossed 40°C during a 48-hour run at 550 W, even at the joint. More test data is apparently on the way, so for now these are the modder's own numbers.

The 12V-2x6 revision was supposed to fix the melting power connector issues. In early 2025, NVIDIA said the 16-pin melting issues were over, pointing to the updated connector on the RTX 50-series. However, the first melted RTX 5090 Founders Edition was reported shortly after, in that case with a third-party cable. Since then, several RTX 5090 power connectors have reportedly melted, including one with an undervolt and a -100 W power limit. Moreover, last month Hardware Unboxed watched its RTX 5090 power cable reach 175°C with a single wire pulling around 22 A.

A repair shop technician has reported another melted 16-pin power connector on an ASRock Taichi TC-1650T PSU, paired with a $15,000 NVIDIA RTX PRO 6000 Blackwell Workstation Edition GPU. The former ships with native 12V-2x6 cables carrying ASRock's own NTC temperature sensor. According to the technician's Reddit post, the connector failed catastrophically on the PSU side and melted into the socket itself, even though both ends of the cable were fully seated. The GPU reportedly survived, and the damage was confined to the power supply side. The technician also says the sensor is mounted on the wrong side of the cable, on the ground line rather than the 12 V side it's supposed to watch, which would explain why it apparently never caught the rising heat in time.

ASRock added the NTC sensor and TempGuard system to its 12V-2x6 cables specifically to shut a system down before a connector melts. This time the system failed to catch the rising temperatures, but it has worked in the past. TempGuard reportedly caught a shunt-modded RTX 5090 pulling over 1,300 W, saving its power connectors from melting. On the flip side, this isn't the first time this exact GPU and PSU pairing has run into trouble either, as a similar melting incident on the same combo surfaced back in March. If the sensor placement is really off on at least some cables, that's a bigger concern than one bad unit, especially when paired with a card that costs as much as a used car.