Having problems with your eMachines T5048 PC Desktop ?

New cpu fan has 3 prong connecter, old has 4. what is,or does the 4th blue wire have to be connected?

Answers :

You should still be able to use the old fan on your new processor. as long as it is not the reason you changed your CPU. The 4th pin is for an inbuilt speed controller(part of the motherboard) this is to save energy and keep the noise down as mentioned by Lee, Give your old fan a good clean before you use it as dust gets built up on the blades and will decrease the fan efficiency and increase the noise.
You can connect the CPU fan as normal but it can only run at one speed and voltage hence only having 3 wires.
Your other CPU fan which had 4 wire was able to run at 2 different voltages and speeds and are mainly used to keep the noise down and run quietly.

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