Memory and Voltages

I've started trying my hand at overclocking and its pretty much left me with a confused and stupid look on my face. Can you tell me about voltages and how you guys are all getting these great memory timings of 5 2 2 2? Does bumping up the memory voltage have anything to do with this?
I have an NF7-S with an XP2100 processor and one stick of Corsair 512xms. Right now I have it set at 10x200 and the core voltage at 1.75. I can't take the memory past aggressive though without making it choke. Where I have it set now seems to run pretty stable under Prime95.
If an explanation gets to involved do you know a link to a great overclocking guide that uses the BIOS on the NF7-S? I've read through a few and they're either obsolete or the BIOS is different and leaves me unsure about a lot of the settings.

Is it 3200 corsair? So you haven't touched the mem voltage at all? I would get it to 2.8 volts right away just to see what it would do.

I recently put together an 8RDA+ with 2x512 paired Corsair XMS3200 CL2.
It doesnt even post at default 2.5v Vdimm but at 2.63 it does 5-2-2-2 at 200MHz.

Hhhmm, I tried kicking the voltage up a notch to 2.7, it didn't do any good. The aggressive timing is 2.5 3 3 8 and turbo is 2 2 2 7 but Windows won't post at that. There are a few settings in the soft menu like the fsb/dram ratio that I have yet to fiddle with. My low IQ and the poorly translated manual haven't yet allowed me to figure out how all this works together.
hehe..I'm like that monkey beating on the monolith with a stick.

The fastest timings for Nforce2 boards are: 2-2-2-14. For some reason my RAM doesn't like CL2 so I run it 2.5-2-2-14 and it does 200mhz on default voltage. Try 2.5-2-2-14 and see if it works.

Didn't happen at 2.5 2 2 14...bummer. I read something about not being able to take down the latency if you're using performance enhancements in one of the other options? This was a quick reference in another thread here and was refering to Intel. This apply to an NF7-S also?
There are several settings in the soft menu and other places that I can't get an accurate description of whats really going on. The manual will just say 'enable for best performance' and I haven't found any guides that are NF7-S softmenu specific and really gets down to the nitty gritty of how all these options work together or exactly what they do.