Depending on which kind of original Xbox version you have, the older ones tend to be far more noisy in comparison to the newer models. This is because the first batch tend to make a humming or buzzing sound and was later on addressed to being fixed by Microsoft themselves. If you find that your Xbox fan is really loud and noisy there are a number of things you can do to help quiet it down.
1) Oil the bearing on the current fan. Open up your console, remove the computer fan, remove the sticker and place two drops of oil in the middle area. This will lubricate the fan bearings and the motor will run much more quieter than before.
2) Replace the fan. If you tried the above and you still find it too loud for your likely, you can replace the current on with a Corsair LED 80mm silent fan that is more of a higher quality. This is slightly bigger than the standard 70mm, which will allow more airflow to be pushed out more efficiently at a quicker rate. You will need to perform modifications such as removing plastic from the edges next to the vents to allow it to fit in.
3) Apply an resister on the positive terminal. You can place an resistor inline with the red positive wire on the computer fan. This will reduce the voltage, therefore the fan motor will run at less rpm. However, this will increase the chances of overheating to occur at an quick rate. So you need to ensure that your console is well ventilated before performing this particular modification. The advantage you would gain from this that it will run whisper quiet and you could not even tell the console is switch on.
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