Sapphire: http://www.sapphiretech.com/us/support/drivers.php
XFX: http://xfxforce.com/en-us/Help/Support.aspx
nVidia: http://www.nvidia.com/Download/index.aspx?lang=en-us
ATI : http://ati.amd.com/support/driver.html
Realtek: http://www.realtek.com.tw/downloads/
Biostar: http://www.biostar.com.tw/app/en-us/support/download.php
Asus: http://support.asus.com/download/download.aspx?SLanguage=en-us
Gigabyte: http://www.giga-byte.com/Support/Default.aspx