ASUS has updated GPU Tweak III so it can automatically shut down a PC when it detects unsafe current on a graphics card’s 12V-2×6 power connector, rather than just flashing an on-screen warning. The change ships in GPU Tweak III version 2.1.8.0 and works only with cards fitted with ASUS’s Power Detector+ monitoring hardware, an optional feature the user has to switch on themselves.
Power Detector+ has shipped on select ROG cards for some time, but until now it could only do one thing when current on the connector climbed past a safe level: warn the user and leave them to react. This update adds a setting that lets GPU Tweak III cut power to the whole system instead, closing the gap between spotting a dangerous current draw and actually doing something about it before a connector or cable is damaged. Because the protection runs through the software, it only works while GPU Tweak III is installed and running in the background, not as a standalone hardware cutoff.
How the 12V-2×6 power connector threshold works
KitGuru reports that the feature pairs one adjustable setting with one fixed one. Users can choose how long current has to stay elevated before it triggers a shutdown, anywhere from one to five minutes, giving some tolerance for brief spikes under heavy load. The current threshold itself is not adjustable: it is locked at 12.5A for a standard 12V-2×6 cable, rising to 18A if the card is running through ASUS’s own ROG Equalizer cable. Both figures replace the thresholds Power Detector+ previously used for its warnings alone, which were 9.2A on a standard cable and 17A with the ROG Equalizer, so the shutdown trigger sits well above where the old alert used to fire.
Which GPUs support it
Because the feature depends on Power Detector+ sensing hardware built into the card itself, only a short list of models qualify. Confirmed compatible cards are the ROG Astral GeForce RTX 5090, ROG Astral LC GeForce RTX 5090, ROG Astral GeForce RTX 5080, and ROG Matrix GeForce RTX 4090. Any other RTX 40 or 50 series card, including ROG models that skip the Power Detector+ sensor, won’t show the shutdown option in GPU Tweak III no matter which version of the software is installed.
From warning to intervention
teqpost covered Power Detector+ when ASUS first built the monitoring into these cards, at which point it could only tell an owner something was wrong. This GPU Tweak III release is the point where that monitoring turns into an actual safeguard: instead of relying on someone to notice an alert and unplug a card mid-session, the software now does it for them once current stays high for the configured duration. ASUS has laid out the configuration steps, including how to set the shutdown delay, in a post on its ROG forum.
For owners of the supported cards, the practical upshot is a second line of defence against connector issues that doesn’t depend on catching a pop-up in time. It’s still gated behind having GPU Tweak III running and the feature switched on, so anyone who wants the protection needs to update the utility and enable it manually rather than assume it’s active by default.
