Thermal Sensors on ASRock Power Supplies Prevent GPU Connector Meltdown

Reports of melting 12vHPWR and 12v-2x6 connectors on high-end NVIDIA graphics cards—and, in some cases, AMD GPUs—have become increasingly frequent in the PC hardware community. In response, manufacturers are introducing new safety features to protect both components and users from potential damage. One notable example is the integration of thermal sensors in select ASRock power supplies, such as the Phantom Gaming PG-1300G.

A recent incident shared by a user named motivman on the Overclock.net forums highlights the effectiveness of these safeguards. The user was running an MSI Ventus NVIDIA GeForce RTX 5090 graphics card, heavily overclocked to draw an extraordinary 1350 watts—far exceeding the card’s standard 575-watt TDP. While it is not unusual for GPUs to surpass their rated TDP during performance boosts, this level of overclocking pushes hardware to its limits.

After completing a demanding 3DMark Port Royal benchmark, the system’s ASRock power supply detected excessive heat and automatically shut down to prevent further damage. The PC remained off until the power cable had cooled, demonstrating the value of the PSU’s built-in thermal protection. This feature likely prevented a catastrophic failure of both the power supply and the graphics card.

However, the incident also revealed some limitations. Despite the successful shutdown, the GPU’s power connector showed signs of discoloration, indicating that it had still experienced significant heat stress. This has led to discussions within the community about whether ASRock should consider lowering the thermal shutdown threshold to offer even greater protection for high-performance hardware.

Additionally, the user reported that benchmark scores dropped noticeably after the thermal event, with the RTX 5090 no longer able to achieve its previous 47,800+ score in Port Royal. This suggests that even with safety features in place, extreme overclocking can have lasting effects on GPU performance and longevity.

As the demand for more powerful graphics cards continues to rise, and as users push their hardware to new extremes, the importance of robust safety mechanisms like thermal sensors in power supplies becomes increasingly clear. These features not only help prevent hardware failure but also provide peace of mind for enthusiasts and professionals working with high-performance PC components.