Here is my final result, not extreme but 100% stable:

450x8
Vcore BIOS 1.5V, Vcore load 1.44V
Performance Enhance Turbo
Multi 2.0A, DDR2-900, 266 strap
Timings 4-4-4-12-3-3-6-42-3-7-Auto-2T 2.1V



3DMark06: http://service.futuremark.com/compare?3dm06=3313019