The dual-channel memory format is the standard for high-end performance systems, and is the de facto packaging for most DDR memory. The "matched pair" format has become very popular, as these DDR module kits are perfectly suited for the requirements of high-end dual-channel DDR operation, and are a much safer buy than purchasing one module now and hoping to match it up later. The most popular configurations are currently the 2x512-MB and 2x1-GB kits (although 2x2-GB are emerging) and with few exceptions, vendors offer the same basic speeds in matched pair DDR kits, as with their single module DDR.
Surprisingly, the news is not as good in the dual channel DDR chart, and the aggregate chart drop only registers at $52 - barely more than half that of the single-module DDR listings. The major difference is the absence of any truly significant price drops, and although two hit double-digits, these only amounted to a $12 price drop to Corsair XMS PC3200LL 2x1-GB and a $10 cut to OCZ PC3200 Platinum XTC 2x1-GB. There is a nice selection of smaller price decreases, in the $1-$9 range, but we didn't find a lot of movement on the other end of things, with the largest price increase being a $5 jump to Crucial Ballistix PC3200 2x512-MB.