Savage S3 card with SuSE 6.4

Dear Sirs, I'm using SuSE 6.4 on a ASUS P2B with Celeron 400, it works fine. My only problem is the graphic adapetr configuration: with SAX2 I'm not able to work at 800 x 600 with 24bpp... I have to stay with 640 x 480, no 3D support and 65536 colors.... it's a limited view, with some windows I have to move them up to reach the OK or CANCEL or APPLY buttons... It's like missing a leg or some fingers!! Can someone please help me?? I'm quite new in Linux, able to edit manually some files if necessary. Thanks a lot in advance. Enrico