LUCI5R -

PLL - Shouldn't need to go higher than 1.58v.

DRAM - It'e estimated that the board overvolts the memory by 0.08v, so 2.02v should give exactly the recommended 2.1v for the memory. And you shouldn't have any problems with the memory til your FSB is over 515mhz

Nb - I see no reason why 1.28v would be the cut-off. We're running 45nm quads with high FSB's. The northbridge needs a good kick in the arse to do so.