Hi Boaty.
Thanks for reporting this issue in Microsoft Community.
In your description, you want an indication of GPU utilization.
I've noticed that you're having issues disconnecting from the server and kicking you back to the game menu while playing Overwatch.
You've tried a number of things, including setting up the power supply, router, and managing graphics card usage through the Nvidia control panel. Thank you for the effort you put into fixing this issue, and I do understand the frustration of not being able to play the game properly at the moment due to some mishaps that are affecting the entire team.
Your computer has an unstable connection to the game servers, and this issue may not be coming from the graphics card, but from the network, or the game's official servers.
Has the unstable connection occurred in any other games? Are there any network problems when using other applications?
In Task Manager, GPU utilization indicates the percentage of the GPU that is currently being used to process tasks. It shows how much of the GPU's resources are being consumed, thus helping you to understand how loaded the GPU is when running an application or game. A high utilization usually indicates that the GPU is handling a lot of computational tasks while a low utilization indicates that the GPU is less burdened, when you play Overwatch and find that the GPU is underutilized, this usually means that it doesn't require a lot of computation in addition to tasks from the GPU.
Here are some ways to boost GPU performance (you've already tried setting up a power plan and setting it up in the Nvidia Control Panel, so it's not presented here)
Enable image acceleration in Settings
1 Right-click the Start button and select Settings
2 Click System>Display>Graphics
3 Click Change default graphics settings
4 Turn on Optimizations for windowed games
In games, try to find dynamic resolutions
For example, in Overwatch try using the Dynamic Resolution Scaling (DRS) feature, which allows you to run the game at the optimal frame rate on your hardware.
If none of these options help you, please contact Nvidia's support staff via the link below and they will be able to provide you with more targeted assistance in this area.
https://www.nvidia.com/en-us/support/consumer/
Disclaimer: Microsoft provides no assurances and/or warranties, implied or otherwise, and is not responsible for the information you receive from the third-party linked sites or any support related to technology.
Thanks for your understanding and support.
Best regards,
Zev - MSFT | Microsoft Community Support Specialist