First of all, I don't own the board, so my comments are
just general ones.
You want to be in Advanced:Jumperfree_config
Look first at the "Overclocking Profile". That setting or one
with a similar name, if you set it to [Manual], will cause
other settings to magically appear. Asus does that, so a
noob will not get themselves into trouble. When everything
is set at Auto, very few useful settings will be revealed.
As you change the BIOS settings to [Manual], all sorts of
cool stuff will be revealed. Go through the BIOS and
try changing an Auto setting to Manual, and see what appears.
For RAM settings, there is a tool called A64tweaker, that
claims to be able to change RAM settings while in Windows.
I don't know if it changes the voltage or not, but it
should allow experimenting with CAS, Trp, etc. How that
is possible is a mystery, as a DDR DRAM controller should
lose all contents of memory, if the standardized JEDEC
startup sequence for the RAM is respected.
http://www.abxzone.com/forums/showthread.php?t=91076&highlight=a64tweaker
Paul