Oh, I also like the computer personally do not support the indiscriminate addition of fans with good can of course you can accept his noise with bad words Oh not only the noise is huge and disturb the original direction of airflow inside the machine and play a counterproductive effect that would not be worth it Oh Answer to your question Look at you want to add a fan on the chassis It does not matter whether it is real or fake can be able to rotate can be blown out of the wind that's right It is not necessary to spend tens of dollars to buy a brand name Ordinary as long as a few dollars to buy can be born out of that part of the money to change the cpu fan that is more useful than the chassis fan. A few dollars to buy it can be born out of that part of the money to replace the cpu fan that is much more useful than the chassis fan The airflow inside the chassis is generally from the front of the lower part of the entry from the rear of the power supply out of the so I personally recommend that the side of the board of the things do not care and then in front of the addition of a fan to the suction of the wind (now a lot of chassis can not be added to the Amen, but in the position of the pci interface will be a large piece of place to open the honeycomb holes, but very good) the back of the air outlet there (good) the back of the air outlet there to add a fan to pump the wind I think this effect is better not only the noise is small and the direction of the airflow inside the chassis does not have much impact to speed up the flow
Oh, purely personal opinion, I hope to help you