3GB of Dual Channel Memory?

Given that the 32-bit versions of Windows XP/Vista can't address more than 3.5GB of memory, I would like to install 3GB in my system. I currently have one 1GB DDR2-667 module.

I am looking at a Mushkin 2x1GB DDR2-800 dual channel kit. I can also buy a single Mushkin 1GB DDR2-800 module. However, the single module is obviously not dual channel. My question is, with all three of these modules installed (slots 1 and 2 occupied by the dual channel kit and slot 3 with the single 800MHz module), will at leas the first 2GB run in dual channel, or will the whole setup revert to single channel since there are only 3 modules? Would I be better off, from a performance point of view, two buy two of the 2x1GB dual channel kits?

Thanks.

(As a matter of curiosity - what would happen if I installed the DDR2-800 dual channel kit in slots 1 and 2 and the single existing 1GB DDR2-667 module in slot 3? I assume that all of the memory would then run at single channel 667. Or would the first 2 GB's run as advertised??)

As cheap as memory is, and depending on which MOBO you have, the best idea would be to buy a 2 x 2gb kit. Or, 2 kits of 2 x 1gb would be the second best solution.

You could also buy the 2x1GB kit and get a 2x512MB kit so that all 3GB runs in dual channel mode. You could also go with the 2x2GB. Personally, I'd recommend going with the 2x2GB kit.