I have a Duron 600 at 1000. I stopped there about 2 years ago. It is still running fine on stock air. I had to clean the fan on it though when it started to get stupid and began to lock up or reboot. I realized it was overheating. I never tried to go higher than 1000 though. I gave it to my mom a long time ago. I should go and try to get it up to 1,100. If I do, do I win? Only one guy is higher I think and he is only 6% higher. Someone else mentioned that OC'ing is about more mhz and not %. Crazy! It's all about doing more with less. If a 300lb man can press 500lbs and a 100lb man can press 475lbs, who is more impressive? If your going for the record than the 300lb man wins for pressing more but "pound for pound", the 100lb man was stronger by a long shot and that my friend is a %. Just change out the pound signs (lb) above with megahertz (mhz) and tell me which is the better overclock. I have to go to mom's now! LOL I think any stable overclock is a success!