Thats where the noise is coming from. Im 95% sure its the GPU. It gets louder at times too.
The gpu can't emit noise, the choke coils certainly do and sometimes there can be a slight buzz elsewhere in the card's power vrm but beyond that the only thing else that can do that is the fan bearings. People need to grow an imagination and some skill on the side to fix problems creatively rather than being hopeless. You can try to cool the chokes on the card either by making your own or finding a plate that can mount on top of the choke coils to cool them while helping to reduce noise. If any of the mosfets in the power vrm that feed the gpu and vram are not directly cooled by a plate or heatsink address that right away to improve life as well stability of the card.