p5q pro voltages

Hi, im new to overclocking. but i understand the ideas and ive read alot. but im more just curious to what is the max voltage to go on the nb and sb and whats the default voltage. i have a set of 2x2gb sticks of g skill 800mhz and the voltage on the box says 2- 2.1v so that means i set the volt in the bios to 2.0-2.1 depending on how stable it is at the lower one. sorry about all the noob questions. but just thought i would check first. because i have a pentium D that just wants to go higher and higher. i got it to 4.25 ghz at 1.3 v without any effort or skill at all haha. prime stable.


also the p5q pro has alot of different voltages and i dont know about. what should i set them to also. thanks