I am now thinking about frequencies ..

on the r606, from a 'hardware health' point of view, is it better to run high frequencies and low voltages or viceversa ? or it doesn't matter ?

for examples is it better to run 900 freq at 400mV or is it better to run 750 freq at 440mV ? or it doesn't matter ? or how do you gauge for the 'perfect' setup ? temps ? anything else ?

what about the newpacs ? I see some of you are running them at 600 freq, what 'safe' temp can I look for so I can just forget about them and leave them running ? (have them now at 350)