Using the editor I have found that my graphics card begins to whine (a high pitched squeeling noise, also known as coil whine).
This is due to the GPU generating a huge amount of frames. This causes the GPU to heat up to around 80 degrees celcius.
The issue is especially prominent when I zoom fully to a unit on the editor.
If I enable VSync the coil whine will stop, and the graphics card will sit at around 40 degrees.