|You need to do some more research. The CPU:DRAM ratio is a requirement for Intel based systems, not AMD. AMD systems haven't used a FSB in years, therefore there is no 1:1 requirement. Intel finally did away with the FSB in it's Core i5 / i7 systems.|
When you change the CPU multiplier on an AMD system, you also change the RAM speed. What you need to do is make sure the RAM is running at 400MHz (DDR800)...you don't necessarily have to overclock it. But without knowing which CPU you have, what your multiplier setting is & which board you have, it's impossible to offer any help.