Is this DDR RAM that you are talking about? Or is it SDR RAM?
Keep in mind that even if you get faster RAM, it will still default to whatever you CPU/mobo supports.
Not sure what RAM your motherboard supports? Then check out my guide on finding out what hardware you have at the top of this forum.
Also, if you arent sure what the difference between the different types of RAM, then check out my RAM guide that is also at the top of this thread as well.
Intel E6750...........PSN: ELBATROP
XFX nForce 650i Ultra
Patriot PC2-6400 8GB (4x2GB)
36GB WD Raptor
Samsung SyncMaster 931c
Samsung SyncMaster 750s
Windows 7 Home Premium 64