This section covers how we can assess noise in ways that are relevant to real photography.
When making a print, a 12.1MP D3 image needs about 1.42X more enlargement linearly than a 24.4MP D3x image. Image quality vis-a-vis noise is directly related to the enlargement size, and so comparing noise must be done at the same area.
The analogy here is scanning one square millimeter of 35mm film vs 1 square millimeters of 645 film, and then concluding that 645 film has identical resolution and grain. It does of course, but the frame as a whole needs less enlargement. Yet that is exactly what some DSLR noise comparisons with digital do: they compare the same number of pixels, representing different areas (magnifications).
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Canon 1Ds Mark III, ISO 3200, striation noise