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SetFloatVectorArray question

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When using SetFloatVectorArray() how many arrays can be set maximum to get maximum performance


a matrix will have 16 floats but how many i could achieve with SetFloatVectorArray()

(I know the number of floats is a multiple of 3...I dont really know...is it?)


another question: Can I inside a pixel shader method access the vector array like this:

float3 vectorArray[12];

//inside pixel shader
uint4 t=Tex2D.Load(uint3(0,0,0));
float a= vectorArray[ t.x][ t.y ];


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