Even better is to get 2 1 Gig memory stick for your dual channel. And if you haven't bought it yet, check the cas latency, make sure they are low.
Beter buy 2 Gig if you can now and have two slots left for future expansion, than buying 1 Gig which is by far enough; but with today's fast changing PC's, we'll soon be in the Tera era!