If it works at all, it won't operate in dual-channel mode,
because dual-channel mode needs identical capacities
installed on each separate channel.
If your motherboard will accept 2GB DIMMs and
if your motherboard supports dual-channel mode,
you'd be better off with 2 x 2GB of identical sticks.
There are plenty of 2 x 2GB DDR2 matched pairs to choose from
e.g. Corsair, Kingston, Crucial etc.
Please post your motherboard make and model here,
so we can confirm its specs.