Originally Posted by Lasereth

*EDIT* RAM speeds are only as fast as your processor. If your processor is 266 MHz FSB, then the 333 MHz stick and the 400 MHz stick will both run at 266 MHz. If your processor is 333 MHz FSB, then both sticks will run at 333 MHz. The CPU controls how fast your RAM operates. Furthermore, buying RAM that's faster than your processor is completely useless unless you want to overclock. If your processor is 333 MHz FSB, 333 MHz RAM is the only RAM you'll ever need.

-Lasereth