128mb x800se volt mod?

I just purchased an x800se (it's a dell pull) from a forums member. The core overclocks pretty well, from 425 up to about 540. The memory will only oc about 20mhz, though. I have more than sufficient cooling, so I would like to crank up the voltage a bit on both the core and memory. I have checked several guides for the x800's and x850's, but none will work for me. It has the r423 core, but he pcb lacks the resistor for the pencil mod and the bank of resistors for the conductive paint mod. I think the memory voltage mods will work, though. Does anyone have any idea how I can increase my core voltage? I will try to take of few pictures of the card and voltage regulating circuitry to give you an idea of what I am working with. thanks