honestly, ddr2 vs ddr3 won't even give you more than 5% boost. stick with ddr2 unless you plan to upgrade your 720be in a short time, then go all out with am3.
mobo: http://www.newegg.com/Product/Produc...82E16813128378
ram: http://www.newegg.com/Product/Produc...82E16820231180
mobo: http://www.newegg.com/Product/Produc...82E16813128378
ram: http://www.newegg.com/Product/Produc...82E16820231180
