Hi guys, this motherboard only supports a maximum of 2gb of DDR2 memory.
Skenny, first - welcome to PHCF

Second, Asus are great boards...nice and reliable. However, that does limit your choices and prices.
If you're looking at upping your memory capacity, you might need to look at other brand boards, MSI, Gigabyte, Abit - all quality boards - at the same level as Asus.
Best bet is to research each board that meets your memory requirements, and ensure that it can do what you want to do with it. Can support your
CPU, has the required amount of spots for hard drives and cd/dvd drives.