MSI Safeguard+ PSU Helps RTX 5090 Owner Spot a Hidden 12V-2×6 Power Issue Before It Became Serious
A new RTX 5090 replacement looked perfectly fine at first, but a power supply upgrade revealed a potentially dangerous problem that may have gone unnoticed until it was too late.
A Reddit user recently shared an unusual experience involving an MSI RTX 5090 graphics card and MSI’s AI1300TS power supply. The user had already received a replacement RTX 5090 through an RMA after the original card showed errors. The replacement seemed to work normally, with no obvious crashes or warning signs. However, after installing a new power supply with MSI’s Safeguard+ monitoring feature, the user discovered that one of the 12V-2×6 connector pins was not carrying any current.
That discovery may have prevented a much bigger issue.
The 12V-2×6 power connector has become a major concern for owners of high-end graphics cards, especially power-hungry GPUs like the GeForce RTX 5090. When current is not distributed evenly across the connector’s pins, some pins can end up carrying more load than intended. Over time, that imbalance can increase heat and raise the risk of connector damage, melting, or failure.
To reduce that risk, several hardware makers have introduced monitoring features, improved cables, warning systems, and redesigned power delivery solutions. MSI’s Safeguard+ is one such feature, designed to monitor the current on each pin of the 12V-2×6 connector in real time. If the system detects abnormal current distribution, it can alert the user through MSI’s software.
In this case, Safeguard+ did exactly what it was designed to do.
After connecting the RTX 5090 to the MSI AI1300TS power supply, the user checked the current readings and noticed that Pin 2 was showing 0 A. That meant the pin was not carrying any current at all. At first, the system status still appeared normal because the screenshot was taken before the alarm triggered, but the Safeguard+ feature later raised an alert.
The user initially suspected a simple cable or connection problem. To rule that out, they swapped the cables and tried the second 12V-2×6 port on the power supply. Neither change fixed the issue. After further inspection, the user noticed that when the connector was plugged into the graphics card, it appeared slightly lifted from the PCB area.
That suggested the problem was not with the power supply or cable, but with the graphics card itself. The replacement RTX 5090 may have had a manufacturing defect affecting the connector or its contact with the board.
The user now plans to send the card back for another RMA. Without the Safeguard+ monitoring system, the issue may have remained hidden because the GPU was not showing obvious errors. Under heavy gaming or workstation loads, the remaining pins could have been forced to carry the full power demand, increasing the risk of overheating at the connector.
This situation highlights why real-time power monitoring is becoming more important for modern high-end GPUs. The RTX 5090 is expected to draw significant power, and even a small problem with current distribution across the 12V-2×6 connector can become serious under sustained load.
For PC builders, this case is also a reminder to carefully inspect GPU power connections, use high-quality cables, make sure connectors are fully seated, and monitor power behavior when possible. A graphics card can appear stable while still hiding a power delivery issue that only shows up through detailed current readings.
In this case, the user’s decision to upgrade to a power supply with per-pin monitoring likely helped catch the defect early and may have prevented connector damage or GPU failure.
