I currently have 9-9-9-24-2N. It came free with with my motherboard. but i fond this 9-9-9-24 on sale. (i will leave links to them). I was wanting to know if i can use both at the same time. to me the 2N is the only differences between them other than the heatsink.
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231428
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231314
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231428
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231314