Which one is more precise depends on the context; both tools serve different purposes.
Which one is more precise depends on the context; both tools serve different purposes.
Since increasing it actually uses more VRAM rather than GPU resources.
Used Task Manager to monitor GPU usage simultaneously with MSI Afterburner. Neither MSI Afterburner nor Game Bar appears highly precise, but MSI Afterburner shows only slight inaccuracies and minor delays.
MSI Afterburner probably checks GPU usage through the drivers. The Xbox Game Bar seems to rely on the same data source as Task Manager—the GPU scheduling subsystem in the operating system. Thinking about the GPU scheduling subsystem being "closer to metal" in the software hierarchy (it's the DirectX graphics kernel subsystem), I feel confident it would be slightly more reliable than the drivers. Also remember, GPU utilization refers to the percentage of time the GPU is actively engaged, not just how many shader units are working. For more details, refer to the NVIDIA issue tracker and the Stack Overflow discussion.