8X agp problems

[chewieee]

ati radeon 9700 pro
abit nforce2 MB
athlon xp 2200

anyways i have 4X agp set in my bios and everything works fine but when i switch it to 8x and load up windows it will show a jumbled screen and just freeze there.. Yes the MB is 8X capable and so is the card. any ideas... catalyst 3.8 is installed so is my lateset chipset drivers

 

[kestrel1]

It sounds like your BIOS doesn't like your graphics card.
Have you tried another graphics card at 8X?

 

[hoffdog]

Have you tried the latest bios flash, it seemed to work in the asus boards that hang when going back and forth between 4x and 8x cards.

 

[SYAR2003]

Svitching to 8X will also feed the AGP card with lower voltage
than in 4X mode .
0,8V instead of 1,5v i think .
You might want to up the agp voltage to get it to work.
If it divides 1,5/2 having it at 1,7v may solve it.