This PC fan is actually 15 tiny fans wrapped up in one and 'it sounds like a bunch of angry bees'

"this fan is basically a meme of the [Noctua] A12X25" ...
PC World

CPU-FAN versus CPU-OPT on motherboards: What’s the difference?

The CPU OPT header is an additional connection for special processor cooling accessories, such as specialized coolers with multiple fans or water-cooling components. Functionally, CPU OPT is identical ...