i would think 1.47 is okay as long as the temps are under control. i know with the 45nm chips, they will start degrading before the temps reach the limit. ie your temp may be 58*C, but if you are running 1.6V through it...so long mr wolfdale. the 65nm i'm sure the same thing is possible. do a search maybe of "absolute max voltage q6600" or something of the sort and see what you find.
unless you have phase change like jseber or ln2, it will start to degrade at a certain voltage...and im not thouroghly convinced that degradation does not occur with those cooling solutions at high voltages.
i'd stick with what you have...maybe 1.5V max everyday usage. i would think that intel's highest recommended voltage is in fact okay for everyday use (if it is 1.5V).
i have overclocked my pcie bus over 125mhz before, but i dont really suggest going over 115. it will improve your benchmark scores, and maybe a small FPS increase. it can also burn up your pcie bus and your card. by "burn up" i mean damage....lol not literally catch fire. although...that would be pretty funny. whats life with no risks, right? lol...
IMO, ATI tool sucks. so, i have no other input on that subject. other than to say that a 6-7 hour session of COD4 (or some other high performance game) with settings and resolution jacked to the ceiling is a better stress test than any kind of synthetic. kind of like how folding is considered a better and more thorough stress test than p95 or orthos.
i have always run linked shaders on my card's overclock. i tried them unlinked several times and was able to get the core a little higher, but they didn't perform as well as having them linked. my opinion.
mcdonald's shakes suck because they use that crappy yogurt/milky/soft crap phony ice cream or whatever you want to call it...
baskin-robbins. now THAT'S a shake.