“GPU power monitoring device not detected” can describe two different problems: a USB-connected sensor or controller is missing from Windows or its vendor app, or a monitoring program cannot read GPU power telemetry. Start by identifying which layer is failing. If the device itself is missing, check its physical USB connection first; if Windows sees it but the app does not, investigate model-specific software support. A GPU power-connector warning is a separate safety issue, not a USB detection problem.
First identify what is not detected
Note the device make and model, how it connects, and which program is expected to display it. A sensor or controller might use an internal motherboard USB 2.0 header, an external USB port, or USB-C. Wiring, pinout, compatibility, and software instructions vary by model, so do not assume that another device’s connection advice applies.
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Then check whether the operating system detects the USB hardware. If it is absent or appears with an error, focus on the connection path and device. If Windows sees the hardware but the vendor app does not, the USB connection may be working; use the device maker’s guidance for that model’s app and drivers. There is no universal app-repair sequence established for all monitoring devices.
Check the USB connection
Internal USB 2.0 header
Shut down the PC and disconnect power before opening the case or changing an internal connection. Check that the cable is on the correct compatible motherboard header and aligned correctly; do not force a connector. If the device has a detachable cable, check its connection at the device too.
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- UPGRADED MULTIFUNCTIONAL USB C POWER METER: Detects the charging status and process of your USB-enabled or type c-enabled devices. Supports QC3.0, QC2.0 and BC1.2. A Must Gadget checks the charging performance (charging speed and quality) of the output wall/car/solar panel chargers and USB charging cables. It can be also used to find the highest current of the Wireless Charger, and test capacity and electric energy of power bank
- PROFESSIONAL SAFETY GUARD: Featured with over-voltage protection, over-current protection, under-voltage protection, low energy protection and alarm system. This upgraded USB Type C tester can detect safety and maximally protect the appliances from damaging. It will cut off output automatically and alarm by sound, while it will save data when power off suddenly
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- QUALITY COMMITMENT: We always believe in the stability and continuous improvement of product quality. Package includes 1 x USB Tester. (Note: If the USB tester does not show any parameters, please insert the small adapter sent with the package into the side hole of the USB tester to trigger the PD charging function)
For its own products, NZXT recommends connecting directly to a motherboard USB 2.0 header during troubleshooting, trying another header, and checking cable seating. NZXT also warns that common USB hubs can cause detection issues with NZXT products. This is vendor-specific advice, not proof that every brand’s device behaves the same way. NZXT notes that many of its products use a 9-pin internal USB 2.0 header, often along the motherboard’s bottom edge; check your motherboard and device documentation rather than relying on location alone.
External USB or USB-C
Check that the cable is firmly connected at both ends, then try another suitable port. If it is USB-C, pay attention to Windows notifications about power delivery, compatibility, or connection mode. Windows documents notifications that can indicate, for example, that the PC cannot provide enough power. Treat a notification as a clue about the USB-C path, not as a diagnosis of the sensor itself.
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- Improved Measurement Accuracy: Our USB C Tester can accurately measure accuracy: ± (1%+5). The data is more accurate for detecting charging devices such as chargers, mobile phones, tablets, and power banks. Make this Type-C meter suitable for more 3C digital peripheral products, making it the first choice for digital gamers and electronics enthusiasts.
- Wide Applicability: This USB power meter is equipped with a 12A high current terminal, which is more stable. Measuring current: 0-12A; measuring voltage: 4V-30V. The wide test range makes this USB meter suitable for more 3C digital peripheral products, and it’s a cost-effective solution for anyone looking to optimize their electronic devices’ charging performance.
- Detect Various Fast Charging Protocols: The USB power meter supports PD2.0/3.0, QC2.0/3.0, FCP. SCP, AFC, PE, DASH VOOC and Super VOOC protocol charging. Whether you’re testing chargers, power banks, or any USB-C device, this tester is up to the task.
- Upgraded Curve Function: This USB C tester has upgraded curve function to better record real-time voltage and current. You can set the time of curve page (5mins/15mins/60mins/2hrs) by long press button to monitor the real-time voltage and current. In addition, the voltage and current of each cell will be automatically adjusted according to the actual voltage and current.
- ISP Color Display Interface: This USB C Power Meter features a 1.06-inch ISP color high-definition display with high resolution and clarity. It can display voltage, current, power, capacity, energy, time, maximum voltage, maximum current, maximum power, current direction, and CPU temperature. You can easily switch between interfaces by pressing a key. Double-click the button to rotate the displayed content.
Cross-test to narrow down the fault
When practical, change one part of the connection at a time and record what happens. MSI recommends checking the cable at both ends, trying another computer port, testing the device on another system, and power-cycling the monitor for problems with monitor USB ports. That advice applies directly to monitors; use the same cross-test logic cautiously with other hardware.
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- If the device works on another suitable port or system, investigate the original host port, header, or configuration.
- If another known-working device also fails on the original connection, the host-side connection is a stronger suspect.
- If the device remains absent across suitable ports or systems, check the device maker’s model-specific instructions and contact its support.
MSI’s monitor USB troubleshooting guide does not establish that every sensor or controller supports the same ports, cables, or diagnostic steps. Do not substitute an unverified cable or buy a replacement device until you have confirmed the model and its connection requirements.
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- VERSATILE USB TESTING: Test voltage from 3 to 20V DC and current from 0.05 to 3A (USB-A) and current from 0.05 to 5A (USB-C), covering most common standard USB ports, including Qualcomm Quick Charge ports
- EXTENSIVE MONITORING: Continuously monitor voltage, current, capacity/charge delivered, energy, and resistance (calculated) for up to 1000 hours, providing comprehensive data insights
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- OVERLOAD DETECTION: Detect voltage and current overload, ensuring the safety and protection of your devices and power sources during testing
- HIGH-RESOLUTION LCD: The hi-resolution LCD provides clear visibility of measurements, even in environments with low ambient lighting, ensuring easy reading of data
When the device is present but GPU power readings are missing
A program’s GPU telemetry is not the same thing as USB enumeration. NVIDIA documents nvidia-smi dmon as a way to report GPU telemetry, including power usage, on supported devices. For example, run nvidia-smi dmon in a command prompt or terminal where NVIDIA’s utility is available. Metric support depends on the GPU and metric; unsupported or failed metrics may appear as a dash. The command checks NVIDIA GPU telemetry, not whether an external USB controller is connected or recognized.
See NVIDIA’s nvidia-smi documentation for supported metrics and usage. If this reports GPU telemetry but a separate sensor app does not, troubleshoot that app and its device according to the manufacturer’s instructions rather than treating the result as a USB test.
Rank #4
- 【Upgraded Multifuntional USB C Power Meter】The USB tester can detects Voltage, Current, Capacity, Electric Quantity, Power, Temperature, Resistance, Charging Time and other data of the USB or type C Port Devices. A Must Gadget checks the charging performance(charging speed and quality) of the output wall/car/solar panel chargers and USB charging cables. It can be also used to test capacity and electric energy of power bank. Measuring voltage: 3.6V-32V; measuring current: 0-8.0A.
- 【Latest Upgraded IPS Color Display Screen】New upgraded version offers 8 IPS main color screen display interfaces, allowing switching the display interface by pressing the key. The fonts are larger in one mode, which can read the data at a glance and facilitate viewing. This instrument can monitor Voltage, Current, Capacity, Electric Quantity, Power, Load Impedance, ect..
- 【Wide Range of Application】The USB power meter comes with A OTG adapter, supports PD3.0/PD2.0, QC3.0/QC2.0, BC1.2 and USB A or USB C port, supports the updated iPhone 13 Pro mobile phone. (Support iphone 13/12/11/X/iPhone Xs quick charging, 29W power, 5V3A/9V3A/12V2.5A/15V2A). Compatible with new MacBook Pro, MacBook, iMac, iMac Pro, Dell XPS, Acer Aspire, HP Spectre, Lenovo Thinkpad, Eluktronics, Razer Blade Stealth, Chromebook, Microsoft Surface Pro and more Type C devices and chargers.
- 【Test Power Bank Capacity】Before testing the power Bank,please fully charge the power bank,insert the usb voltage tester and double-click to clear the data,then connect the load or mobile phone (continuous discharge is required).ensure that the discharge voltage is 5V or 9V.(mAh is multiplied by 1.35 when discharge voltage 5V, and mAh is multiplied by 2.45 when discharge voltage is 9V, which is equal to the exact capacity of the battery of the power bank.)
- 【Professional Safety Guard】This USB C tester featured with over-voltage protection, over-current protection, under-voltage protection, low energy protection. This upgraded USB Type C tester can detect safety and maximally protect the appliances from damaging. It will cut off output automatically, while it will save data when power off suddenly.
Do not confuse a GPU power-connector warning with missing USB hardware
If the actual symptom is a red Power Detector+ warning in ASUS GPU Tweak III, it concerns the GPU’s 12VHPWR or 12V-2×6 power connector sense pins—not a USB sensor. ASUS documents a red warning when one or more of six sense pins reads 0 amps, or when one or more reads more than 9.2 amps. Those are ASUS’s documented conditions for this feature, not general USB or sensor thresholds.
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Shut down and unplug the PC before inspecting the connector. ASUS advises checking that the cable is fully seated, examining the cable and GPU socket for damage, and verifying PSU suitability. Do not handle or reseat a powered GPU connector. Follow the card maker’s instructions; ASUS’s Power Detector+ guidance describes its warning procedure.
Best Value
- Superior Charging Performance Monitoring: Monitor the charging performance of all USB and Type C devices, including wall and solar panel chargers as well as USB cables. This tester can accurately measure voltage (3.6V-32V) and current (0-8.0A), making it ideal for assessing power bank capacity and electric energy.
- Broad Compatibility with Quick Charging Protocols: Supports the latest PD and QC fast-charging protocols, including PD3.0/2.0, QC3.0/2.0, and BC1.2. Compatible with a wide range of devices, from the newest iPhone 16 Pro to MacBook Pro, Dell XPS, Chromebook, Surface Pro, and more, ensuring versatility across USB A and Type C ports.
- Comprehensive Safety Protections: Equipped with over-voltage, over-current, under-voltage, and low energy protection. This tester automatically cuts off power if it detects any issue, preventing damage to your devices. It also saves data during sudden power outages, preserving valuable information.
- IPS Color Display with Easy Interface Navigation: This upgraded USB tester features a vivid, high-resolution display with eight color-screen interfaces. Easily switch views to monitor voltage, current, capacity, power, load impedance, and more, all in one glance.
- Precise Power Bank Capacity Testing: Accurately test power bank capacity either by direct load testing or by calculation. To determine capacity, charge the power bank fully and divide the Wh reading by battery voltage (e.g., 35Wh ÷ 3.7V = 9.46Ah or 9460mAh), offering reliable insight into actual capacity.
When to contact the device maker
Contact the manufacturer once you have checked the connection using instructions for the exact model and, where possible, tried another suitable header, port, or system. Include the device model, connection type, the operating system’s detection result, the software that should recognize it, and the cross-test results. Without the hardware model and those results, it is not possible to determine reliably whether the device, cable, host connection, or software needs replacement or repair.
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