Remember the very fact that you are dabbling with voltage changes implies that you are playing with fire as it is risky to you and to the system because unless you are absolutely sure of what you are doing it would make more sense to use a Phenom overclock guide.
There are several online books available on the process of overclocking take advantage of them to do foolproof Phenom overclocking.
It is vital that you carefully monitor the temperature of the CPU when overclocking and also ensure complete CPU cooling and case cooling.
When overclocking if the temp reaches a reading of above 50, immediately stop your CPU and begin again.
Always monitor the temps when you have ventured into the overclocking world.
There are a number of CPU cooling options in the market choose one that meets the needs of your CPU.
Besides CPU cooling case cooling too is vital for the system to give optimum performance, without proper cooling your overclocking will not function properly.
Refer to some online books to get the most of your overclocking experiment.
A Phenom overclock guide should give you all the necessary steps required to overclock your CPU.
One method that is frequently followed of overclocking is to enhance the FSB.
This actually enhances both the processor bus and the memory bus.
If the processor still has the capacity to increase its speed but the memory has already been optimized you have the option of using the memory divider to reduce the speed of the memory by running it at a slightly lower speed that specified.
There are a number of online guides for overclocking your CPU and you will come across Phenom overclock guide too and you can refer to online overclocking books to optimize your CPU's performance after overclocking.