Can't set vertical refresh rate more than 60Hz

Hello,

I've installed the RedHat 8.0, I've an Intel 82845G/GL 64M graphic cart and I can't set my vertical refresh rat more than 60 Hz. However in Windows XP I can go up until 90Hz.

I've got an AOC Monitor 7VIr+
compatible  VESA, XGA, SVGA, VGA
Horizontal: 30K~70KHz
Vertical: 50 ~160Hz
Pixel Frequency 110MHz
max resolution 1280x1024@60hz

I've tried already to put a personal modeline in my XF86Config file but nothing changes. I can't even decrease the vertical refresh rate, even with a generic Vesa driver.

In attachment, my XF86config in case you need it. 

Could you help me please.

Tank you
Yves