honestly 2gb is perfectly fine. windows won't even recognize 4gb without some heavy tinkering. i'm not sure that stuff would be good for overclocking though.
edit: i just looked again at that. that's ddr2, not compatible with the mobo/cpu i listed.
http://www.newegg.com/Product/Produc...82E16820231047
that looks good. wish i could find my gskill, but it's hard to come by these days.
edit: here's a review of my ram.
http://www.overclockersclub.com/revi...ll_2gb_ram.php this stuff will do 300 fsb on stock (2.6) voltages.