My PC uses PC2700/DDR333. Can I use PC3200 /DDR400?

[My geputer uses PC2700 (DDR333). Can I use PC3200 (DDR400)?]DDR memory was designed to be backward gepatible so generally speaking, you can safely add faster memory to your geputer. For example, you can install a PC3200 DDR module in a geputer that calls for PC2700 DDR. However, keep in mind that faster memory will not necessarily make your system faster. You can't speed up your geputer by adding faster memory if other geponents in your geputer (your processor or other memory modules) operate at a slower speed.