coil whine sounds like a low or high frequency buzzzzzzzzz, it can be loud or barely audible.
and yes, all electronic parts can get coil whine. the tahiti cored r9-280x/280 cards were famous for it, as is the new GTX 970... but while it has a propensity toward those current modern cards other cards can get it as well. you see coil whine is caused by an unfortunate and uncontrollable coincidence where the ceramic in the transistors are formulated in such a way they VIBRATE in harmony with the frequency of the electrical power flowing through them. this is almost entirely random, and completely uncontrollable by the gpu/psu manufacturers. certain cards run at certain frequencies and use certain transistors which makes for it to be more common among some cards then others.
now here is the thing. Coil whine can go away with time. the noise you're hearing is the ceramic of the transistor vibrating against the circuit board. over time the ceramic will wear away and the noise will go away. That said having owned a gpu with coil whine i found it was far too loud to just ignore until it went away. so i ended up selling it off and buying a new one. (yes the new owner knew the reason for the extreme price discount was coil whine prior to purchase)
a loud clatter sounds like a fan hitting something, an electrical buzzzzzzzzzzzzz is coil whine.