So you're running an AMD build, right? To be honest, I’ve always been a bit more of a Team Blue kind of guy myself, so I don't have quite as much hands-on experience with their stuff... but listen, you really don't need to sweat the ratio between your RAM and your processor... just let that part go because, frankly, that kind of metric only really matters when you're staring at synthetic benchmarks.
If you actually went ahead with what you were suggesting, you'd find that the CPU frequency would end up being exactly the same anyway...
Here, I'll drop a link for you so you can dig into the details a bit more, since overclocking AMD hardware can get a little bit more finicky and complicated than other setups...
http://forum.pcekspert.com/showthread.php?t=72136