Any ideas about the "dual channel DDR2-533" memory in the I9300?

Can I just pick up an aftermarket pair of 1GB (each) SODIMMs and expect them to work fine as dual-channel?

Buying from Dell with the machine costs me CAD$700 extra vs. the "standard" 1GB. Aftermarket seems to be US$200/1GB stick, or about CAD$500 for 2GB.

Thanks