"Intense" is the best word I can use to describe it because I'm not sure what it is, whether it's RAM, GPU or CPU.

If I pan the camera in unity:

A high pitched noise issues from the computer. The picosecond I start panning the sound starts. Stops the picosecond I stop panning.

If I start an infinite loop:

2.0.0p247 :016 > x = 1
 => 1 
2.0.0p247 :017 > while x < 2 do
2.0.0p247 :018 >     puts 'huzzah!'
2.0.0p247 :019?>   end
huzzah!
huzzah!
huzzah!

An identical high pitched noise can be heard. I don't think it's the GPU due to this simple experiment. Or any monitor-weirdness (although the sound does sound like one of those old CRT monitors if you're old enough to be young when those things were about) The CPU? Or maybe my SSD? It's my first SSD and the first time I've heard this noise.

Should I be worried? Regardless, what's causing this sound? I can't think what would cause such high frequency vibrations.

I built the PC myself. Not enough heat paste on the CPU? Too much? Just no idea what's going on.

Info:
CPU Type    QuadCore Intel Core i5-3570K, 3800 MHz (38 x 100)
Motherboard Name    Asus Maximus V Extreme
Flash Memory Type   Samsung 21nm TLC NAND
Video Adapter   Asus HD7770