The number of dual-channel DDR platforms continues to increase, and has really created a subset of the memory market. The "matched pair" format is becoming increasingly 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 the 2x256-MB and 2x512-MB kits, and with few exceptions, vendors offer the same basic speeds in matched pair DDR kits, as with their single module DDR.
The high-end matched pair DDR price list is active again this week, but as in the single-module list, we're seeing prices move up and down. Supply seems to be a huge influence in this area, and there are "buyer runs" on certain brands and speeds, that create a vacuum that can truly impact prices. It's not all bad news, as many higher-ed PC4000 and PC4200 Kits dropped this week, and in some cases, represent a better relative deal than the PC3500-PC3700 range.