hi to all sifus...need help on overclocking my system

1) p4 3.0GHz presscott:
i was able to o/c my cpu to 3.75GHz with fsb set at 250MHz. the question is how much is the Vcore threshold for this cpu? default should be 1.375v now o/v to 1.4125v is it still in the safe region?just dun want to burn my cpu....my current temp is around 53~55c max...is it fine?

2) Corsair pc3200 xms twinx ver1.2 (ch-5?)default timing is 2,3,3,6
my mobo is asus p4p800se, the max o/v i could do is just 2.85v and the result is 2,2,3,5@200Mhz but if o/c the fastest speed ascertain is 2.5,4,4,8@225Mhz, which one is better? also anyway i can go higher on the voltage for the vdimm? any alternative rather than using the ocz booster?

1) besides ur overclocking results what interest me is the temp...53-55c max???if i were u i kick in more vcore coz ur presscot is consider a cool one...mine at the office running 67-75c stock vcore....
[/quote]so what is the max voltage this cpu can take?

2) i havent heard any bioses that has the option but u can try to get booster and find out if u can pump in more juice...since it is safer that vmod...its better too...
[/quote]any info how to use this booster? thanks so much for the helps....