It supports 800 and 533 FSB means it will support LGA 775 Pentium 4 non dual core processors having FSB 800 and FSB 533...
Now for ur given Board Model number, *www.gigabyte.com.tw/Products/Motherboard/Products_Overview.aspx?ProductID=1932
You can see that the board supports only 184 pin based DDR mudules upto 266/333/400 MHz ...
DDR2 needs 240pin connectors with the motherboard which your board doesnt have... hence I am sorry u cant use DDR2 RAM mudules with the mention model !!!