Key information
Amid frequent reports of 12V-2X6 power connector burnouts on NVIDIA GeForce RTX 50 series graphics cards caused by uneven load management, a Reddit user named DallasGrave has modified an MSI RTX 5090 to improve thermal performance and power distribution.
The modification connects the card's original 12V-2X6 power slot to an extra adapter circuit board featuring two 8-pin PCIe power slots, effectively turning the power delivery into a hybrid design of 12V-2X6 combined with two 8-pin connections.
Because each 8-pin PCIe cable handles roughly 150W of power and utilizes thicker, more heat-resistant wiring, this solution theoretically reduces the burden on the 12V-2X6 connection by half, helping prevent overheating and melting when the RTX 5090 reaches its 600W peak load limit.
During a 48-hour high-pressure test running at 550W, the user reported that all wires, connectors, and solder joints maintained temperatures below 40°C. This compares favorably to standard single 12V-2X6 setups that typically run between 50°C and 60°C under full load, or exceed 100°C when load balancing is abnormal.
While critics point out that currents still ultimately converge at the 12V-2X6 header where oxidation or deformation can still pose risks, the author notes that the modification successfully lowers total resistance and shares power across lines to prevent immediate catastrophic burnout.
