Simple. If your RAM can't support high speed and you don't want to upgrade your RAM, use memory divider. This will run your RAM async to your FSB. Please note that there will be some performance hit but if you use AMD64 , the hit is quite low as the memory controller is in the processor. You might lose only around 100Mhz speed if you run 4:5 so if you can overclock more than 200Mhz compare to the memory contraint, you should get positive gain.