Here is examined noise from ISO 100 through ISO 6400, plus what Nikon calls ISO L1.0 (50) and Hi-2 (25600).
Be sure to use a colorspace-aware web browser to view the example on this pages, which are in ProPhotoRGB.
My usual sharpening was used at Amount = 60 for the RAW conversion of all ISO values, which has some noise-enhancement effects.
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