WHAT DID I DO?

I tried to overclock my e6400 from 417 fsb to 425 fsb, that is something that shouldn't cause a major problem like what happened to me. Before my idle temps were about 40 degrees, after I overclocked to 4.25 fsb they were 43-44. I tried prime95 and immediately it said there was an error. This had happened to me before and what I did before was I had forgotten to raise the vcore. I went back to my bios and did that. then my temps were about 45 idle and prime95 barely started when I also started to open speed fan and my comp crashed. I restarted and when I did my system bell or whatever it's called turned on (which I think I set to go off when my bios read 60 degrees) and then it shut down. Now when I start windows it goes to 53 degrees, which has never happened, and idle is now at 44 degrees! This is with the same settings as before I tried to get ti to 425 so what did I do wrong? Did I break my cpu?? Is that even possible????

Well I guessed that it wasn't stable and thats why I I lowered it back to 417. I don't know why but after I brought my cpu back to stock everything then clocked it back to 417 it became perfectly cool and stable again. Is there any reason why this happened?

I'm using a gigabyte ds3 and an antec 550 psu. If I put a hs on my volt regulators can I get a higher clock?

Is there any way to tell what is the problem is, if it's the volt regulators , or ram, or what?

*sigh* I guess a 56% overclock should do. It's a shame though because I have seen 6400's get a bit higher.