至于SP数量除以处以4，那个是因为NV50架构以后的GPU都是垂直模式（vertical mode），一个像素/顶点的rgba/xyzw四个分量都在一个SP上处理，所以4个cycle才能处理完成一个像素/顶点。
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垂直模式还更加接近于语义Web标准，比如rdf。
A vertical schema is also closer to semantic Web standards like RDF.
这种模式称为垂直模式(vertical schema)，它有两个主要优点。
This kind of schema, known as a vertical schema, has two main advantages.
通过定义视图而不是显式的表，可以避免垂直模式的主要缺点，即许多查询要求它与本身进行联结，而这种操作是很昂贵的。
By making a view, rather than an explicit table, we avoid the main disadvantage of a vertical schema, namely that many queries require it to be joined with itself, which can be expensive.
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