can't change agp aperture size

[biomanz]

I have a Gigabyte 848P and I can't find the option to change the aperture size. I have the latest bios, and tried pressing ctr+f1 in bios as mentioned elsewhere. Is there another way to change this setting, perhaps in rivatuner? Thanks.

 

[wpshooter]

Don't you have the motherboards' owners manual ? All BIOS setting should be in there.

 

[biomanz]

Nope, it's not in the manual