Ok, well, welcome to OC3D first of all mate!
I'm gonna have to second what Allubz just said. Full system specs would let us in on the bigger picture.
You seriously want to think about getting some better cooling going on, if I was in your position I'd drop the vcore a notch and try and get a stable OC going, those temps are scary for a 45nm chip! I've got an e4300, one of the most resilient core2's ever made imo, and I'd never let it get much over 60c.
If you're running stock cooling, you might as well take your 4ghz and be happy with it! The last time I hardcore overclocked was on socket 478, so a lot of my knowlege is outta date now i guess, but one thing that'll always be true (unless you're running amd
), is, the colder your chip is, the better it'll treat you.
4 gigs is a respectable OC, unless you're benching or your pc is a toy, ask yourself if you are happy with the performance, and if your PC does what you want it to. I havent spent long trying to squeeze a few more mhz out of my computer, because it doesn't really make much difference to me.
Hope I've given you something to think about, please get some better cooling though, you're hurting that wolfdale!