From the blog "Nikon D7500 DSLR for Astrophotography"

The Nikon D5300 has a well-earned reputation as one of the lowest noise DSLR cameras used for Astrophotography.  Now that I have a new Nikon D7500, I was keen to see how it compared to the D5300 in terms of the level of read noise and the extent to which that read noise is non-random ( and thus needs to be removed using a Master Bias frame to prevent it summing up during image integration).    So here goes ... ......... A single bias frame Nikon D5300: ISO400, 1/4000th second: