ATI Catalyst tweak guide.
My settings, running SH3 at 1024x768/32bit/85Hz, on a X850XT:
- Anti-Aliasing x4 (temporal AA off)
- Anisotr.filtering x16 (makes sea look better at distance)
- Catalyst AI disabled
- mipmap-level > quality
- vert.refresh > off, unless
- Adaptive AA enabled, quality (makes fences and wires on your sub look better)
Using your card, I'd probably set mipmap-detail level to performance, instead of quality.