How can i get full stability with less 1.625v?

Hello friends... I have only some you doubt about the FSB/multiplyer ratio. I have a AXP Mobile 2500+ that works with 1.45v default but i'm trying to get 2.2ghz @FSB 200 but unhappyly it don't works the Prime95 with full stability. I arrived at 215 FSB @2.250mhz with 2:20hs in the Prime95 ties to give error. but i've got that with 1.625v... strangely I obtain 2400mhz with FSB200 and 1.55v only (without a full stability). This amount of VCore (1.625v) is too much for 2.200mhz? Can I leave in the day-day with these values without damaging my PC?
Since now i tank you so much!!!!
PS: Sorry by my english... i'm learnig!