WHat is the "SAFE VCORE limit" of a AMD X2 [4200+]

Hi the topic said it self

I have searched through allot of forums, and some saying do not exceed v1.45. But i see many users pushing higher. What is actually the maximum wihout shortin its lifespan?

PC specs:
X2 4200+ @artic freezer Pro 64
Asus A8N-SLi premium
corsair 3500LLpro 2GB

I did a small O/C to 2.4ghz (stock 2.2), without having to pushing the vcore Up, just stock vcore. The reason that is holding me back to push futhur is that I dont know what vcore is safe. 2.65ghz is achievable, but the prob is that my asus board has the fluctation bug. So it will be sometimes 1.487 or sumtin and sometimes below it 1.4375. So it is hard to stick it to a the proper 1.45.

Any helps are welcome

*EDIT* Oh yea 1 thingie, My cpu operates quit cool, Idle 26-28 Full load (prime tested) 39-41(40 most of the time). And this was @ 2.4ghz (200mhz o/c)

1.5 is a good stop point. That may NOT be your mobo thats causing the fluctuations. What kinda Power Supply ya got?

You'll get about 2500 to 2600mhz out of that, easy at those volts with that cooler.