I have my 9800 pro set as follows and never had any problems playing any games with good fps and max details, including far cry:
the main settings for 3d and open gl are set in the center or balanced:
AA and AF are set to app preference
texture preference and mipmap are set to max
vert. sync off
true form always off.
under troubleshoot tab, fast write always off.
In my games options, I always select 2 to 4 AA and 2 to 4 AF when possible
I play all my games at 1280 x 1024 and never had any problems.
My gaming machine:
P4 2.8 GHz
2 X 512 MHz PC3200 in dual DDR mode
Intel D865PERL MOBO
integrated 6.1 MAX audio
Logitech duo MX mouse and KB
ATI RADEON 9800 PRO