Comment by Joel_Mckay

Coil whine is common in budget setups, but often it is also just cheap MLCC Piezoelectric acoustic harmonic noise. Most EE impassioned pleas for large solid polymer capacitors to knock down the noise completely... are often ignored for cost reasons, or factory replaced with liquid-electrolytic type that slowly degrade over time until they literally explode on occasion.

The "Fast, Cheap, or Good... choose any two..." joke is very real. =3