If I am not mistaken, AMD has different rule regarding fsb and ram speeds than intel. Since AMD run a 200 fsb stock, I don't see how you are expected to run it at the same speed as RAM.
For example: If I run my CPU stock, it has a 200*10=2000mhz. If I am running DDR2 800, I would have a /5 divider. So, 2000/5=400mhz, 2 times the FSB. Due to the memory controller on AMD, it is different animal than Intel.
look here at the bottom:http://www.neoseeker.com/Articles/Ha...lon64oc/4.html
or, read the whole article. Good info if a bit dated.