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12VHPWR Guard protects RTX 5090 from connector failures

Simon Ellis 2 min read

A free open- source tool called 12VHPWR Guard monitors per- pin current on RTX 5090 cards to prevent connector failures and hardware damage.

12VHPWR power connector on a graphics card
PC HARDWARE

We built a free, open-source safety net for high-end PC gamers who are still worrying about RTX 5090 power connector failures. The new tool, 12VHPWR Guard, addresses a specific hardware design flaw in 's latest cards where manufacturers removed the shunt resistors that normally help monitor power delivery. This matters because those missing sensors left users with no visibility into per-pin current draw, creating a risk of undetected overheating and potential hardware damage.

12VHPWR power connector on a graphics card
The 12VHPWR connector is the focus of the new safety tool.

Redditor releases free software to monitor power delivery

Redditor Khalid developed 12VHPWR Guard as a Windows application that monitors the 12VHPWR connector on specific ASUS graphics cards. The tool currently supports the ASUS ROG Astral RTX 5080, ASUS ROG Astral RTX 5090, and ASUS ROG Matrix RTX 5090. It communicates with the GPU via the I2C bus to read real-time current data from each individual pin in the power connector.

  • Compatible GPUs: ASUS ROG Astral RTX 5080, ASUS ROG Astral RTX 5090, ASUS ROG Matrix RTX 5090
  • Current Threshold: 9.5A (adjustable)
  • Time Threshold: 15 seconds (adjustable)
  • Fallback Mechanism: HWiNFO shared memory
  • Action on Trigger: Force-closes background apps and shuts the system down

The software enforces strict safety thresholds to prevent connector damage. If any single pin pulls more than 9.5A for over 15 seconds, the tool triggers an immediate shutdown. This 9.5A limit sits below ASUS's own 9.2A warning threshold, providing an additional safety margin. The system action includes force-closing background applications before cutting power to the hardware.

Khalid says the tool was largely 'vibe coded,' meaning he leaned on an AI coding assistant during development. The application leans on HWiNFO's shared memory as a backup if it can't talk to the sensors directly. This free software solution reportedly outperforms paid hardware solutions like the ASUS ROG Equalizer cable and ASRock TempGuard in preventing connector failures.

We've been tracking 12VHPWR Guard closely — see our earlier coverage on NVIDIA RTX 5090 connector melts, Club386. The tool provides a critical layer of protection for owners of expensive GPUs that lack internal current monitoring hardware. Users can download the open-source utility to actively monitor their power delivery and prevent costly hardware damage.

Source: TweakTown

NVIDIA

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