The system works fine at all default bios settings. The system fails post if I set the FSB to manual. I am confident all my other settings (SPD, voltages, etc) are fine, as the system works as long as the CPU clock control is set to auto or 333. Could the power supply be the issue?
I can manually set the voltages (1.9V DDR2 as memory spec, default CPU voltage, everything else set to auto), CIA2 disabled, 2.0 mem multiplier, all the standard o/c preparation stuff, and the system boots fine as long as the FSB is left at auto or 333Mhz. With everything set the same, I can set the clock control to MANUAL and then change the FSB to 334Mhz, and the system will fail to boot. I've tried other FSB settings 332, 340, 350 - all fail. Set it back to 333Mhz and it boots fine.
Been tearing my hair out trying to figure this one out.
it looks like memory problem insteads psu problem, when you set the FSB to 334, what is you memory speed? if you set memory to 1:1 ratio, it is only 668, way below the 800, if you oc the memroy over 800, it may required more voltage or loose timing.