For an E8400, CPU ref can prob be left at stock .760(in ET6) note that changing VTT will change this but ET6 doesn't account for it.
You can likely do around 3.8Ghz with stock setting, may need more MCH core, mine needs 1.24MCH for 3.8Ghz on stock volts with 2x2GB ram.
After you get higher you need to lower MCH ref, .70v is a good starting point, which is according to ET6. So to set this you leave VTT on 1.2v and lower MCH ref to .70, then raise VTT up to where you want.
As you raise clocks higher than 4.3Ghz and higher FSB you prob have to raise MCH core(up to max of ~1.36v) and lower MCH ref(to as low as ~.65v)
If you want to look at others settings in this thread read starting from ~page 20 in this thread for settings



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