The problem is that your GPU is overloaded. The GPU performance monitor in the Task Manager doesn’t give an accurate view of the actual load. It also looks like you have Multithreading enabled on the CPU (it shows 48 logical processors) which isn’t great for Aximmetry. Aximmetry and Unreal aren’t great at utilizing multiple cores, so you should optimize for the best single threaded performance in the BIOS.

You should take into account that the A4000 is a quite weak GPU and that using a “professional” GPU offers no advantage in Unreal and Aximmetry. A RTX 4090 will perform much, much better:

https://www.topcpu.net/en/gpu-c/geforce-rtx-4090-vs-rtx-a4000

Finally, it looks like your GPU is running at 91 degrees! This will likely cause throttling, so you should look at optimizing the cooling.