I ahve included below a couple of screenies that I currently have fully stable and the max i can get out of my RAM.

As you can see I have kept the FSB at 400 because the RAM beocmes unstable no matter what I try on anything over 1600Mhz. The ram is rated at 1800Mhz so that is what is getting to me.

I run the CPU at 450FSB and clocked the RAM down and done all the usual stress test and it passes no problem so I know my Mobo/CPU are comfortable running @ 450FSB ( I even managed to get a stable FSB of 465).
So my theory is the RAM is the issue when trying to get 1800MHZ.

I have tried tweaking the DRAM clock skews etec etc but nothing seems to help getting anything over 1600Mhz
I am using A2/B2 slots