the duron is definitely easier to oc by more... or from what i've seen anyway.
I see alot of people able to get their duron 700 to 1000 very easily. This is in part due to that the voltage for the duron is lower than that of the tb. So raising to 1.85 volts give higher oc'ing potential for the duron.
As for mine? Well, all i did was unlock the multiplier, max out the voltage and set my mulitiplier at 9.5.
That was it. (couldn't get 10.0 multiplier, just wouldn't go) I have also increased fsb to 103 before, to get around 978Mhz, but i just leave it at 950.
It's rock solid, not one crash in over 2 weeks.
As for my cooling, i use the loud GW FOP38 and it keeps me at 33C idle.