don't download from Intel!!!!
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you mention that the EVGA links don't work, if they don't work than go to Nvidia site and download your drivers from there. I have a 780i and the 4500 working with no issue, mind you that i have not "upgraded" the firmware.... I am using the "old" firmware that came "in" the box. do not upgrade and go here to download your motherboard drivers. Oh and I'm using driver version 15.23 for the motherboard
http://www.Nvidia.com/Download/index.aspx?lang=en-us