edit it’s not the fan making the noise either, I’ve manually activated the fan to see if the fan is causing the noise, and it’s a separate nose to the one annoying me. the noise I’m hearing is a more grind-y noise like a motorbike or propeller airplane that keeps going in and out

If manually limiting your GPUs fan speed doesn’t change it then GPU usage isn’t the cause. The spike in usage is just a symptom.