I can't get it to work in dual channel. POST and CPU-Z say it works in single channel (and I believe them ).
The only difference between the RAM modules (according to CPU-Z) is the Part Number.
One is 1024736750L, the other is 1024636750L.
I didn't buy them together. I used to have 1GB and I bought another 1GB which was the same manufacturer, same size, same speed.