The delivery speed is fast, the fan price is affordable, and there is basically no sound.
I bought it several times at this store. The wind at 1800 rpm is still strong, and the sound is acceptable.
Slow speed is about 1750r/min, the noise at full speed is a little obvious, and there is almost no noise at 1300r/min
Same price, same brand, same cooling method
Reference quotation: ¥19
Reference quotation: ¥16