You can actually use any config file named whatever you please (with creative setup). Check your XFree log to see which config file is in use (listed within the first 10 or so lines from the top).
Not sure what you mean by 'fix the framebuffer'. What problem do you have with the framebuffer, which framebuffer are you using? What 'blank screen' are you using to boot X (are you using startx or is the machine booting up into graphical mode)?
"..the triumph of evil is for good men to do nothing."
VIDIA video driver RPMs for Fedora
:: see yum repo at livna.org