Here's what I believe is the best that I'll get using the F8i BIOS.
Attachment 53177
Using these settings Orthos passed 12hrs.
CPU Clock Ratio:.................... 8x
CPU Host Clock Control:.......... Enabled
CPU Host Frequency (Mhz):..... 406
PCI Express Frequency (Mhz):. Auto
System Memory Multiplier:...... 2.00
Memory Frequency (Mhz):....... 812
DRAM Timing Selectable:........ Manual
CAS Latency Time:................. 5
DRAM RAS# to CAS# Delay:... 5
DRAM RAS# Precharge:.......... 5
Precharge delay (rRAS):......... 18
System Voltage Control:......... Manual
DIMM OverVoltage Control:..... +0.4V
PCI-E OverVoltage Control:..... Normal
(G)MCH OverVoltage Control:.. +0.2V
FSB OverVoltage Control:....... +0.2V
CPU Voltage Control:.............. 1.4750
When I tried 420x8 Orthos failed. I couldn't Boot with any FSB above 420. My previous 406x8 using 4-4-4-12 passed orthos for 30 min but failed at 46 min. When I raised the timing to 5-5-5-18 Orthos was still running after 12 hours.
I believe that I have a memory problem. I tried 266x8 3.00 (ddr 800) and this booted with orthos for 30 min. I tried 266x8 3.33 (ddr 885), 256x8 3.33 (ddr 852) and they wouldn't boot. I then tried 280x8 3.00 (ddr 840) and 420x8 2.00 (ddr 840) and they booted.
Waiting for the next BIOS.