Legit Reviews takes a look at the 4200+ AM2 processor
The AMD Athlon 64 X2 4200+ AM2 processor comes set to run at 1.35 Volts and to go higher than 2.76GHz we need to increase the voltage running to the processor. To do this we just need to go to the system voltage menu in the BIOS and increase the voltage from 'auto' to whatever Voltage you like. The BIOS cautions going over 1.65V and that's not a concern since we just to bump it up to 1.55V to reach 3.0GHz on our processor...Overclocking the AMD A64 4200+ AM2 Processor