anybody know how changing the GTL ref voltage on cpu affect cpu life

I saw a post that seem values of 70-80 are helpful per Tony aka Big Toe(supposedly better than 48/48)
I changed mine to 70/70/128 and was able to lower cpu vtt from 1.23 to 1.21...according to Intel papers cpu vtt of 1.26 is max and on my mobo 1.23 bios=bios reading of 1.26

also Iwas able to load winxp at 3600 at same vcore as 3500 and this usually would just hang on screen after the initial post