The KT266 supports both SDR SDRAM and DDR-SDRAM (as well as VCM), so the VIA reference board has both 168 pin SDR DIMM slots, as well as 184 pin DDR DIMM slots. They are arranged in a 2+2 configuration, similar to Shuttle´s AV32. The KT266 supports up to 4GB of RAM, but obviously you aren´t going to be able to reach that amount with a board supporting two DIMM modules. However, a few manufacturers will be developing 4 DDR DIMM KT266 boards.