This past weekend I put two sticks of 1GB RAM in my computer. This RAM (Geil) was packaged as dual channel. The packaging said it was optimized for dual channel machines, which mine is. I notice they sell single channel sticks, which are cheaper, but seem to have the same specs. 2GBs dual channel-$299. 2GBs single channel sticks-$240. Is there really any difference between the two, or is it just a marketing (and money) ploy?