One bit of advice: One Thing At A Time!
Start by finding max FSB. Low CPU multiplier, RAM on a low divider (if you can), no more than 2 sticks of RAM. So with CPU multi on 6x, find your highest stable FSB frequency, without changing any voltages. Now you know where FSB will fail, which could be a function of CPU or chipset.
Then back to stock, use say 8x or 9x multi, keep RAM freq low, raise the FSB and test until the system becomes unstable. Now you know roughly where the CPU's limit on default voltage is.
Then back to stock again, low CPU multi but RAM 1:1, raise the FSB freq and test until the system becomes unstable. Now you know something about the RAM limitations.
And so on, raising voltages, checking load temps. It's an iterative process that takes time and you learn the system characteristics as you go, what the limits are at each increase in voltage. If there is a serious issue with your system, you will discover what that is by being methodical.
Hope this helps.