The 4pin fan wont work with the 3pin cable.
* well you could probably butcher it so that it did fit, but meh.
Just buy a cheap 3pin fan - https://www.overclockers.co.uk/akasa-ak-191-sm-smoke-ultra-quiet-120mm-fan-3-pin-fg-037-ak.html
The reason for the fan cable extension was that some fan cables arent long enough to reach the motherboard system fan header.
* well you could probably butcher it so that it did fit, but meh.
Just buy a cheap 3pin fan - https://www.overclockers.co.uk/akasa-ak-191-sm-smoke-ultra-quiet-120mm-fan-3-pin-fg-037-ak.html
The reason for the fan cable extension was that some fan cables arent long enough to reach the motherboard system fan header.