hmmm i haven't messed with a kg7 in a while , but after looking around i found a manual for it

try this go into the softmenu and change the fsb rate (cpu: sdram: pci ) from 3:3:1 , thats the defualt to 4:4:1 .
i am thinking that you has it set at 133 fsb but the pci is running at 1/3 of 133 which is way to high . now this is just a guess but i think that also runs the agp speed and if i am right with the fsb at 133 and the fsb rate set at 3:3:1 your running your apg at like 83mhz instead of 66mhz . if it is at 83 that is way outta spec and will make your video ugly in 3d .
give it a try and see if it helps