According to the manufacturer's web-site:
http://usa.asus.com/product.aspx?P_ID=0pKBwEIE8tqMT4j7
this motherboard has 4 x DIMM sockets,
supporting a maximum of 4 GB
of DDR2 800/667/533/ Non-ECC, Un-buffered Memory
and supports Dual Channel memory architecture.
So, add one 512MB DDR2 533 Mhz RAM into one of the slots,
being sure to leave *ONE* *EMPTY* slot between the two sticks,
in order to enable the high-performance "dual-channel" option.
Try your computer -- it should feel faster.
If you still think that need more RAM, buy two 512MB (or two 1024MB) DDR2 533 Mhz RAM, putting the 2 sticks into the two empty slots.
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