I don't know how your M2N32 is setup, but the BIOS in my A8N-SLI is set up accordingly:
At the main screen, you have several tabs on the top. Next to MAIN, choose the ADVANCED tab. From there, the first option is CPU CONFIGURATION. From there, one of the options is DRAM SETTINGS. In there, you will find an option to set your RAM divider. Mine lists it as DDR400 (which happens to be the RAM I'm running_, DDR333, DDR266, DDR200, etc. Well, I'm running DDR400. However, if I try to run my memory at a 1:1 ratio with my CPU frequency (273) then I will be trying to run my memor much to fast. So, I use a RAM divider. I use the BIOS to slow down my RAM to DDR333. This is a 5:6 divider; that is, my memory is running at about 83% of the CPU frequency. This means that while my CPU is running at 11x273, my memory is running at about 220mhz. I've slowed it down to the point that it can run with the rest of my settings. Slowing down my RAM a bit allowed me to get a better overclock out of my CPU.