I've been using wbxtune.exe to give me a little boost in the northbridge department, and I thought I'd pass it along.
Read about wbxtune and how to use it: http://www.overclockers.com/tips607/index.asp
Neat, huh? The problem is that you have to register it to use it past the trial period, and there doesn't seem to be any way to register it. (If you speak Japanese and you figure it out, please tell me! :P )
The good news is that you can extend your trial period by deleting HKEY_LOCAL_MACHINE\SOFTWARE\Softhouse333\wbxtune\AuthorizationCode.
Here is the software (no longer available from the author's site, as far as I can tell), reg.exe (Microsoft registry manipulation tool from the Windows NT4 reskit), and a batch file (smackbx.bat) that uses reg.exe to extend your trial period, all in one handy zip file.
Enjoy!
RAM bandwidth increase :)
Yup, it's a great program! 
You can also find it here: http://www.bp6.com/board/dload.php?acti ... &file_id=5

You can also find it here: http://www.bp6.com/board/dload.php?acti ... &file_id=5
-Derek