This is the real answer. Other apps might be bottlenecked by IO so the CPU doesn’t work as hard. Get faster disks, the CPU will see more use. Since top
is so small that it loads into memory almost instantly, and has no need for further IO, the CPU is free to spin all the way!
People get worked up when CPU usage is high, but unless there’s a resource leak somewhere, that just means the computer is working at full efficiency.
I have the non-GRE version of that GPU. It always says it’s throttling but I’ve learnt not to give that much thought. The temps are always good and frame rate doesn’t seem to suffer so it doesn’t seem to be throttled.