you can upgrade it upto 1gb using sd ram...
if you want to use ddr1 than you have to remove white colour jumpers that is locatted on the right hand side of the board near the the place where we insert sd ram...after removing this you can insert ddr1 ram in red ports,but remember u cant use sd n ddr1 simultaneously it may harm your motherboard
you can upgrade it upto 1gb n can experience very good speed..
n if possible install network card to improve internet speed....