Anandtech has posted a review on the Gigabyte GA-6RX Apollo Pro266 ATX
motherboard.

VIA took this opportunity and released the Apollo Pro266 chipset, the world´s first Pentium III chipset with support for DDR SDRAM. Previously VIA took advantage of Intel's failure with the i820 chipset and released the Apollo Pro133A, which filled the gap between what the market asked for and what the 440BX chipset couldn't provide, such as AGP 4X and 133MHz/PC133 support. This time around VIA again tried to use the Apollo Pro266 to provide the market with what the i815E lacks, using DDR technology to provide more memory bandwidth as well as a larger memory capacity (the i815 still only supports 512MB of PC133 SDRAM).

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