The Qx should be no problem. Fix the FSB at 266MHz, and increase the CPU multiplier. You'll be only left with vcore and PLL voltage to adjust. You can forget all the rest, your NB will be stock and the RAM too, so you can get your stable vcore/PLL combo for the speed you like.

After that, increase the FSB and decrease multiplier till you reach the speed you got in step 1

Now, you can tweak vFSBT, vNB, vSB, vDDR, timings, memory dividers...

Buying a QX to stuck at 380MHz is a total waste
"Update" from f4a to f3g, looks like it went well...



All Auto (just Strap @ 333).