The equipment description is not a good enough. D3 is a older version. I would like to know more detailed differences between D3 and D3S. To see the pictures of motherboard's for example. To know what's is the inside in S3 and S3S maybe I would order more expensive D3S. Without to see the differences on pictures I decided to buy the basic D3. I expected that D3S is only marketing illusion. Later I have found some informations on russians forums. That's all. The official producer informations are weak. There is no a official review or test in music magazines or so on.