I had a look at the manual for your board. There are no options for overclocking.
Your best bet is to snoop around the overclocking forums to educate yourself in what is involved. Maybe some smart guys on those forums have figured out a way to modify your board to run the clock faster. But be aware that even the experts fry components while modifying their hardware and general overclocking.
Getting more ram will help as linderman said. If you are sucking up lots of ram with heavy applications and starting to hit the swap file alot then it will help. Follow the manuals instructions carefully when buying more Ram, many boards are very specific as to what ram will work, most need the same exact speed, size and timing to work properly.