This baby is LOONGGG!
Therefore, it is not surprising that cheap coolers, which can be found everywhere in the shops, turn out to be of rather poor design. These cheap products can easily be identified. The heat sink of the cooler is made of cast iron instead of aluminum or copper and the fan comes without a acceptable bearing. Already after very short time the cooler quits its job and ends where it should - in the rubbish possibly taking the CPU with it.
Source: Tom's Hardware - More Information
Therefore, it is not surprising that cheap coolers, which can be found everywhere in the shops, turn out to be of rather poor design. These cheap products can easily be identified. The heat sink of the cooler is made of cast iron instead of aluminum or copper and the fan comes without a acceptable bearing. Already after very short time the cooler quits its job and ends where it should - in the rubbish possibly taking the CPU with it.
Source: Tom's Hardware - More Information