We are looking at a hardware workaround for the MSI GeForce RTX 5090 Ventus 3X OC that addresses the thermal stress on its power connector. This modification matters because it offers a path to lower cable temperatures for users who plan to run the card at maximum power draw. The fix involves adding external power cables to the native interface to share the electrical load.
Custom PCB adds two extra 8-pin connectors to reduce thermal stress on the MSI RTX 5090 Ventus 3X OC power interface
The modification targets the 12V-2×6 (12+4 pin) power interface found on the graphics card. A Reddit user known as @DallasGrave demonstrated the technique by soldering a custom PCB to the card. This PCB adds two sets of PCIe 8-pin connectors to the existing port, creating a three-way power delivery system.
Modification Test Results
- Modification Type: 12V-2×6 to 3-way power (12V-2×6 + 2x 8-pin PCIe)
- Current Draw: ~3A
- Max Temperature: <40°C
- Test Duration: 28 hours
Testing results show that the modification significantly reduces the current draw on each individual cable. The current per cable dropped to approximately 3A during the load tests. We also observed that the cable temperatures remained below 40°C throughout the entire testing period.
The test duration lasted for 28 hours while the graphics card operated at a 550W full load. The source explicitly warns that this mod requires technical skill to perform correctly. The modification does not completely eliminate the risk of overheating and may introduce new safety hazards for inexperienced users.
This hardware mod provides a concrete method to reduce thermal stress on the MSI RTX 5090 power connector. The three-way power delivery system successfully lowered cable temperatures and current load during extended high-power testing. Users should weigh the technical effort required against the potential thermal benefits before attempting this modification.
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