The only reason it's confusing to read is because you're not using the Queen's english.
I'm not sure what your board is but I believe setting the RAM to 5:4 in bios will get you a 400 effective 800 MHz DDR2 RAM frequency. Does your BIOS say 1:1 anywhere?
EDIT: Oh yeah, usually one can achieve higher overclocks with just 2 sticks of RAM and not 4. Just be sure and choose the proper 2.