Q: Why the system can't boot when I set my Duron 600 at 500MHz after loading the fail-save or optimized default option? (KT7-RAID)
A: If you experience a 600MHz Duron failing to boot when set to 500MHz (either manually or by fail-safe/optimized default loading), clear the CMOS via jumper and manually set the CPU to the correct frequency (600MHz).