new GPU and now my pc is shutting down seemingly randomly

Hi kagemyth,   Welcome to Microsoft Community. Thank you for posting your advisory regarding device stability issues. It sounds like you're dealing with a frustrating and complex issue.

Thanks for sharing your efforts so far, which provides us with some direction to analyze the issue.

The event 41 kernel power task 63 error typically indicates that the system has experienced an unexpected shutdown or reboot. This can stem from hardware, software, or power-related issues. Given the context of your GPU upgrade, the new PowerColor 9070XT Hellhound introduces several variables that could be contributing to the problem.

The power supply unit (PSU) is a critical component to examine. The 9070XT has a higher power draw compared to your previous 2080 Super, with a TDP of around 304W. While your Corsair 850 HX PSU should theoretically handle this, factors like aging components, power delivery stability, or even transient power spikes during gaming could cause shutdowns. The need to toggle the PSU switch suggests a potential issue with power delivery or protection mechanisms being triggered.

Sometimes, some specialized software may be able to adjust the status of the hardware.

Clean Boot starts Windows with a minimal set of drivers and startup programs. It can be used to determine whether a background service or program is interfering or causing a problem. 

• These steps of "clean boot" might look complicated at first glance. However, to avoid any trouble for you, please follow them in order and step-by-step.
• Please be careful not to disable any services that may be related to security credentials or security authentication, such as TPM, Security, Credential.
• Disabling services incorrectly will result in inaccessibility to the Windows desktop environment, for example, PIN cannot be verified.

Many devices may have product similar to Armoury Crate, Lenovo Vantage, MSI Center, Dragon Center enabled and installed by default, they are dedicated hardware management tools provided by device manufacturers.

• We can't say arbitrarily that they are the direct cause of the problem, but according to some similar posts, such dedicated hardware management/optimization tools provided by device manufacturers may conflict with the system and cause strange problems.
• If you wish, you can try to check and temporarily disable the options inside these applications before performing further system-level actions or perform a clean uninstall process for similar components.

The type or version of the driver can also be a common factor related to device stability.

The Microsoft Basic Display Adapter is a built-in driver that ensures basic display functionality when the standard GPU driver is unavailable, outdated, or causing issues. It is often used as a temporary measure for troubleshooting display problems or installing the correct graphics driver. To check the generic graphics driver that comes with Windows: 

• Press Win + X and select Device Manager.  Or, in the search box on the taskbar, type device manager, then select it from the results.
• Select the arrow next to Display Adaptersto expand it.
• Select and hold (or right-click) the listing for your graphics device, then select Update driver> Browse my computer for drivers> Let me pick from a list of device drivers on my computer.
• Check the Microsoft Basic Display Adapter, select Next, and then follow the instructions to install it.

Testing an earlier version of a driver is a common choice for comparative observation.

If you wish, you can try to perform a "clean uninstall process" of the driver and test an earlier version of the driver to check if the problem persists with an "older version" or "older combination". After the driver "package" is removed from the device, the driver cannot be installed by scanning for hardware changes. Please be careful to back up the driver installation files in advance.

To perform a clean uninstall of a driver using Device Manager:

• Open Device Manager: Press the Windows key, type "Device Manager," and press Enter.
• Locate the Device: In Device Manager, find the device whose driver you want to uninstall. Expand the category if needed.
• Uninstall the Device: Right-click on the device and select "Uninstall device".
• Delete the Driver Software: In the uninstallation window, check the box that says "Delete the driver software for this device" (if available).
• Confirm and Restart: Click "Uninstall" and then restart your computer.
• This process ensures that the driver is completely removed from your system.
• For older versions of the driver, you can visit the device manufacturer's product support site.
• For the graphics component, you can also perform a clean uninstall of the driver again using your AMD tool or the DDU you mentioned. AMD Cleanup Utility

Power management features in both the BIOS and the operating system deserve attention.

The power state policy may unexpectedly cause incomplete driver initialization, resulting in strange problems.

In the system, fast startup is an option that may be related to the power state.

If you want to disable the S4 state(fast startup) in Windows, follow these steps.

• In search box, type powercfg.cpl and press Enter.
• Select the Choose what the power buttons do link.
• (Optionally) Click Change settings that are currently unavailable.
• Clear the Turn on fast startup (recommended) check box.
• Select Save Settings.

On some devices, the BIOS/UEFI page may offer more advanced power management strategies.

• For example, ERP-related options. Erp is Energy-related Products' energy efficiency requirements in Europe.
• If you plan to boot to UEFI or BIOS: Boot the PC, and press the manufacturer’s key to open the menus. Common keys used: Esc, Delete, F1, F2, F10, F11, or F12. During startup, there’s often a screen that mentions the key. If there’s not one, or if the screen goes by too fast to see it, check your manufacturer’s site.
• Here is an example from Asus site. [Motherboard] How to disable standby power of the USB connected device | Official Support | ASUS Global

Another dimension to consider is thermal and electrical stability. The instant shutdowns without BSOD or artifacting suggest a hard power cut, which could be triggered by thermal protection mechanisms or electrical anomalies like voltage ripples or harmonics. The fact that the system crashes even during idle or low-load scenarios (e.g., overnight downloads) points to a potential issue beyond just gaming stress.

The event viewer logs and the absence of BSODs indicate that the system isn't encountering typical software crashes but rather abrupt power loss. This aligns with hardware-level triggers, such as PSU faults, GPU power spikes, or motherboard VRM issues.

If you have some experience in adjusting the frequency of your hardware, you can try changing the frequency of your hardware to check if the situation is the same. This is not mandatory, but if you plan to try it, always remember to back up important data in advance.

Here is an example from the AMD forum related to similar problems.

How to Solve Kernel Power Failure / Event ID 41 pe... - AMD Community

If possible, you can try to perform some more complex cross-tests. For example, connect the new GPU component to other devices (such as your friend or family member's device) to check if the situation is the same. Cross-testing often helps further narrow down the problem to a specific combination.

Thanks for your patience and understanding.Best Regards,Kyo.Y - MSFT | Microsoft Community Technical Support