Rampage Extreme - getting FSB:DRAM ratio 1:1 and clocked to specs

800Mhz = DDR3 1600, and i believe thats the highest "official" ddr3 speed, so thats what theyre running at by default. 1:2 ratio is your only way of getting your ram close to its spec, if you set it to 1:1 it will run at 400MHz(ddr3 800) as that is your FSB speed(im guessing, but seems to me that it is).

Yes, ddr3 1600 runs at 800mhz, guaranteed. And yes, you can make it run at ddr3 1800 or even 2000, but its not a flick of a switch.

I assume that your cpu is already overclocked and running on FSB 400MHz.
Your memory speed is an effect of that value and the FSB:RAM ratio. As i said earlier, if you set the 1:1 ratio your memory will run at 400mhz too, as thats the fsb base clock. At the moment youre using 1:2 ratio which gives you 800Mhz for memory on fsb 400MHz. Now i think that 1:2 is the highest ratio available, so if you want to increase memory speed you have to raise the FSB frequency above 400MHz. That will result in further cpu overclock unless you reduce the CPU multiplier.
If you know how to do the whole thing than im pretty sure you can easily reach fsb 450 or 500 and have your ram running at full speed.