6 volt cpu fans for pegatronm2n78-la violet 6-gl8e

[hr13]

Do I need a 6 v. or 12 v. cpu fan for my HP desk top. The original fan has failed and all other fans I try run slow and the screen reads cpu fan failed. What fan do I need, and where do I get it?

 

[unreal9400]

12V 4-pin power connector.
http://www.newegg.com/Product/Product.aspx?Item=N82E16835186134