It doesn’t invalidate anything you’re saying, but I think the calculation is incorrect.
4096 x 2304 = 9,437,184 pixels
Color Bit Depth per pixel = 10 bits per channel
Channels = 3 (RGB) channels (If there is an alpha channel or more, like OpenEXR, then you’ll need to multiply)
Total Color Bit Depth per pixel (across all channels) = 10 x 3 = 30
Total bits = 30 x 9,437,184 = 283,115,520 bits = 35,389,440 bytes = 33.75 MB per frame.
On top of this, you have to account for metadata for DPX, which is not a lot if you’re only calculating data rate.
@24fps, Data Rate = 33.75 x 24 = 810 MB/s.
Get the Free Comprehensive Guide to Rigging ANY Camera – one guide to rig them all – DSLRs to Reds to the Arri Alexa.