Why does the computer only start in PCI-E Sync overclocking mode when overclocked?

Question

Overclocking

Hello! I have a Xeon E5450 Revision E0
Motherboard ASROCK G31M-S (1 revision)
The problem is that the computer starts only if in Overlock mode the frequency increase is synchronized with the PCI-E frequency increase (PCIE sync)
Due to the fact that I increase the frequency up to 365hz, the PCI-E bus rises to 109, and artifacts appear after starting Windows, but if you switch to Async and leave the PCI-E bus at 100 or 101, and increase the CPU frequency a little, then the PC does not boot. (black screen, I have to reset the bios) What should I do?
ps bios modified!