added:
I had some time tonight to have an hour or so of overclocking this little dude with my new H50 cooler seen here:
http://www.cybergamer.com.au/forums/thread/48351
/ and my Gigabyte MA78G-DS3H, I got the AMD Athlon II X4 620 to
3835Mhz with my voltages set at 1.7V. It's a mean chip which overclocks and handles the voltages very well.
Basically, I just increased the CPU Voltage till I was happy with (stability:overclock)1.7V for a suicide run (since it could handle the voltage for the initial experimentation),CPU-NV voltage to 1.325 and upped CPU frequency a few Mhz at a time. Changing the memory ratio and the CPU-NB VID were the main stability controls I encountered. All overclocking was done on the BIOS.
You can check out the CPU-Z validation here
http://valid.canardpc.com/show_oc.php?id=980660
I'll try to fine tune it more in the future, and I'll post an update

Look forward to a H50 review in the next few weeks if I can get around to it.
Thanks for reading!
Posted on Thursday, 28th January 2010