|You first need to list your CPU number in order for us to tell that.|
You also should tell us exactly what RAM you have so we can recommend the correct combinations
Max Voltage depends on the CPU model so we can look up the specs.
Monitor your temperature with HWMonitor or SpeedFan because heat is your enemy and the more voltage you use, the more heat you generate. Use only enough voltage to achieve stability with your overclock and no more. OverVolting is the easiest way to destroy your CPU, so be careful. My Core 2 E7500 and E8200 both list a max voltage of 1.3625V. If your CPU has a similar max voltage, you are way too high. I am stable at a significantly higher overclock on both CPU's at a much lower voltage. This means that my system is running at a much lower temperature and therefore I can run them 24/7 if I need to without problems. Go back to the stock voltage, monitor temperature, and test stability. If you have stability, you do not need more voltage, but you can possibly try a higher overclock until you run out of stability. Then you can try raising the voltage by two or three hundredths of a volt for stability. Verify your settings with CPU-Z.
What is your RAM speed set to? What is your FSB? Your base frequency? Your CPU multiplier? What is your CPU/Ram Ratio? Are you trying to achieve a 1:1 Ratio?
Reply with all of the requested information above and include also all of your current BIOS OC settings, your temperature readings (in degrees C), and how and if you have determined stability.
If you just post your partial results without the important requested information and the details on your OC, then we cannot help you.
You have to be a little bit crazy to keep you from going insane.